**Full Changelog**: https://github.com/mongodb/mongo-php-driver/compare/2.1.0...2.1.1

**Full Changelog**: https://github.com/mongodb/mongo-php-driver/compare/1.21.0...1.21.1

**Full Changelog**: https://github.com/mongodb/mongo-php-driver/compare/2.0.0...2.1.0

**Full Changelog**: https://github.com/mongodb/mongo-php-driver/compare/1.21.0...2.0.0

## New Contributors
* @asgrim made their first contribution in https://github.com/mongodb/mongo-php-driver/pull/1782

**Full Changelog**: https://github.com/mongodb/mongo-php-driver/compare/1.20.1...1.21.0

## New Contributors
* @mickverm made their first contribution in https://github.com/mongodb/mongo-php-driver/pull/1745
* @macintoshplus made their first contribution in https://github.com/mongodb/mongo-php-driver/pull/1752

**Full Changelog**: https://github.com/mongodb/mongo-php-driver/compare/1.20.0...1.20.1

**Full Changelog**: https://github.com/mongodb/mongo-php-driver/compare/1.19.4...1.20.0

**Full Changelog**: https://github.com/mongodb/mongo-php-driver/compare/1.19.3...1.19.4

**Full Changelog**: https://github.com/mongodb/mongo-php-driver/compare/1.19.2...1.19.3

* PHPC-2391: Update drivers tools to v2 by @alcaeus in https://github.com/mongodb/mongo-php-driver/pull/1573
* PHPC-2394: Update libmongoc to 1.27.2 by @jmikola in https://github.com/mongodb/mongo-php-driver/pull/1575

**Full Changelog**: https://github.com/mongodb/mongo-php-driver/compare/1.19.1...1.19.2
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* PHPC-2382: Allow static builds with php-src by @jmikola in https://github.com/mongodb/mongo-php-driver/pull/1555
* Use stable version of release tooling by @alcaeus in https://github.com/mongodb/mongo-php-driver/pull/1558
* Add test job to build and install PECL package by @alcaeus in https://github.com/mongodb/mongo-php-driver/pull/1559
* Merge v1.18 into v1.19 by @mongodb-php-bot in https://github.com/mongodb/mongo-php-driver/pull/1561
* PHPC-2326: Run static analysis by @alcaeus in https://github.com/mongodb/mongo-php-driver/pull/1539
* PHPC-2388: Install VC15 component for PHP 7.4 by @jmikola in https://github.com/mongodb/mongo-php-driver/pull/1565
* PHPC-2388: Simplify steps for VC15 installation by @jmikola in https://github.com/mongodb/mongo-php-driver/pull/1567

**Full Changelog**: https://github.com/mongodb/mongo-php-driver/compare/1.19.0...1.19.1
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* Prepare 1.18.1 release by @alcaeus in https://github.com/mongodb/mongo-php-driver/pull/1534
* Merge v1.18 into master by @mongodb-php-bot in https://github.com/mongodb/mongo-php-driver/pull/1533
* Merge v1.18 into master by @mongodb-php-bot in https://github.com/mongodb/mongo-php-driver/pull/1536
* Disable fail-fast for Windows Tests by @alcaeus in https://github.com/mongodb/mongo-php-driver/pull/1535
* Merge v1.18 into master by @mongodb-php-bot in https://github.com/mongodb/mongo-php-driver/pull/1537
* PHPC-1674: Automate Driver Releases by @alcaeus in https://github.com/mongodb/mongo-php-driver/pull/1538
* Merge v1.18 into master by @mongodb-php-bot in https://github.com/mongodb/mongo-php-driver/pull/1542
* PHPC-2373 and PHPC-2374: Upgrade libmongoc 1.27.0 and libmongocrypt 1.10.0 by @jmikola in https://github.com/mongodb/mongo-php-driver/pull/1540
* PHPC-2378: Update libmongoc to 1.27.1 by @jmikola in https://github.com/mongodb/mongo-php-driver/pull/1545
* PHPC-2255: Add database name to CommandFailedEvent and CommandSucceededEvent by @jmikola in https://github.com/mongodb/mongo-php-driver/pull/1543
* Enable auto-merge in merge-up workflow by @alcaeus in https://github.com/mongodb/mongo-php-driver/pull/1546
* Merge v1.18 into master by @mongodb-php-bot in https://github.com/mongodb/mongo-php-driver/pull/1547
* PHPC-1584: Sign releases by @alcaeus in https://github.com/mongodb/mongo-php-driver/pull/1544
* Merge v1.18 into master by @mongodb-php-bot in https://github.com/mongodb/mongo-php-driver/pull/1548
* PHPC-2373: Include uthash in PECL package by @jmikola in https://github.com/mongodb/mongo-php-driver/pull/1552

**Full Changelog**: https://github.com/mongodb/mongo-php-driver/compare/1.18.1...1.19.0
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** Task
* [PHPC-2335] - Replace usage of hub with gh in GitHub Action workflows

** Task
* [PHPC-2322] - Remove ICU and add SRV to phpinfo() output
* [PHPC-2334] - Upgrade libmongoc to 1.25.2

** Task
* [PHPC-2258] - Upgrade libmongoc to 1.24.2
* [PHPC-2263] - Detect XSI or GNU strerror_r() implementation during build process
* [PHPC-2270] - Define constants for POSIX features and extensions used by libmongoc 1.24
* [PHPC-2271] - Upgrade libmongoc to 1.24.3

** Epic
* [PHPC-2214] - Int64 Improvements

** New Feature
* [PHPC-324] - Create a BSON document iterator class
* [PHPC-326] - Document and PackedArray classes to represent raw BSON data
* [PHPC-1949] - Allow explicit construction of Int64 objects
* [PHPC-2197] - Support queryable encryption range indexes
* [PHPC-2203] - Support Queryable Encryption v2 protocol for MongoDB 7.0
* [PHPC-2212] - Support overloaded operators for Int64 objects
* [PHPC-2213] - Support casting of Int64 objects to scalar integers

** Task
* [PHPC-2035] - Require hello command + OP_MSG when 'loadBalanced=True'
* [PHPC-2069] - Require hello command for connection handshake to use OP_MSG, disallowing OP_QUERY
* [PHPC-2163] - Update php-edge-versions latest-stable in Evergreen to PHP 8.2
* [PHPC-2164] - Refactor run-ocsp-responder.sh to use activate-ocspvenv.sh
* [PHPC-2200] - Add MongoDB rapid releases to Evergreen matrix
* [PHPC-2226] - Test against MongoDB 7.0
* [PHPC-2228] - Upgrade libmongocrypt to 1.8.1
* [PHPC-2250] - Upgrade libmongoc to 1.24.1
* [PHPC-2252] - Fix method signature for Serializable::unserialize() implementations

** Improvement
* [PHPC-1941] - Use OP_MSG to authenticate if server supports OP_MSG
* [PHPC-2158] - Cache AWS Credentials Where Possible
* [PHPC-2165] - Expose server error replies in BulkWriteResult
* [PHPC-2188] - Permit tlsDisableOCSPEndpointCheck in KMS TLS options
* [PHPC-2236] - Allow compression libraries to be configured at build time
* [PHPC-2244] - Return Int64 instances when converting raw BSON objects to PHP values

** Bug
* [PHPC-2218] - Speculative authentication state is incorrectly kept

** Task
* [PHPC-2221] - Upgrade libmongoc to 1.23.4

** Epic
* [PHPC-2093] - Key Management API

** New Feature
* [PHPC-2083] - BSON handling for enum classes

** Task
* [PHPC-1710] - Document upcoming signature changes in interfaces
* [PHPC-1929] - ReadConcern tests need not exhaustively test each constant
* [PHPC-1945] - Remove class_exists checks from SKIPIF blocks in Decimal128 tests
* [PHPC-2064] - SKIPIF output may be ignored for tests using skip_if_not_clean on PHP 8.1
* [PHPC-2111] - Replace zend_parse_parameter_calls with PHONGO_PARSE_PARAMETERS macros
* [PHPC-2115] - Remove manual fetching of DateTimeImmutable class entry
* [PHPC-2117] - Test with PHP 8.2 on GitHub Actions
* [PHPC-2118] - Use debian11 and include MongoDB 6.0 for load balancer testing
* [PHPC-2124] - Ensure that null is still accepted for optional parameters
* [PHPC-2128] - Create stub files for functions
* [PHPC-2130] - Remove proto definitions from source files
* [PHPC-2136] - Final modifier should precede method visibility in stub files
* [PHPC-2143] - Add Windows builds to GitHub Actions and publish DLLs for releases
* [PHPC-2146] - Refactor type map struct
* [PHPC-2147] - Update AppVeyor config to clone PHP fork of the Windows SDK
* [PHPC-2153] - Test with PHP 8.2 on Evergreen
* [PHPC-2154] - Test with PHP 8.2 on Appveyor
* [PHPC-2166] - Use void keyword in prototypes for functions that take no parameters

** Improvement
* [PHPC-1708] - Add return type information to final classes
* [PHPC-1711] - Add return type information to interfaces
* [PHPC-1928] - Remove unnecessary casts to zend_long
* [PHPC-1944] - Add final modifier to __set_state methods
* [PHPC-2015] - Use stub files to generate arginfo
* [PHPC-2101] - Default Binary constructor $type parameter to TYPE_GENERIC
* [PHPC-2103] - Allow applications to detect crypt_shared availability
* [PHPC-2120] - Upgrade libmongocrypt dependency to 1.5.2
* [PHPC-2125] - Reduce expected removeKeyAltName operations to a single findOneAndUpdate
* [PHPC-2126] - Allow RewrapManyDataKeyResult.bulkWriteResult to be optional
* [PHPC-2142] - WriteResult getters should return null and emit deprecation notice for w:0 writes and return zero otherwise if libmongoc result is omitted
* [PHPC-2151] - Validate masterKey option for createDataKey() and rewrapManyDataKey()
* [PHPC-2168] - Use consistent int types for APM fields and snprintf for string conversions

** Task
* [PHPC-2157] - Upgrade libmongoc to 1.22.2

** Task
* [PHPC-2135] - Test with consistent versions of crypt_shared and server
* [PHPC-2137] - Upgrade libmongoc to 1.22.1 and libmongocrypt to 1.5.2

** Epic
* [PHPC-2045] - FLE 1.0 Shared Library
* [PHPC-2091] - Queryable Encryption Support

** New Feature
* [PHPC-1899] - getServerConnectionId for command monitoring events
* [PHPC-2005] - Support 'let' option for multiple CRUD commands
* [PHPC-2049] - BulkWrite and Query support comment option of any type
* [PHPC-2085] - autoEncryption options for queryable encryption
* [PHPC-2092] - ClientEncryption options for queryable encryption
* [PHPC-2096] - Implement Manager::getEncryptedFieldsMap()
* [PHPC-2097] - Enable ClientEncryption constructor

** Task
* [PHPC-2053] - Remove mongodb.mock_service_id INI option
* [PHPC-2078] - Allow PECL release-upload.php to verify version constants
* [PHPC-2086] - Test against MongoDB 6.0
* [PHPC-2090] - Add MongoDB 5.0 to load balancer CI matrix
* [PHPC-2099] - Add crypt_shared to CI matrix as an alternative to mongocryptd
* [PHPC-2109] - Document Queryable Encryption API as "Public Technical Preview"

** Improvement
* [PHPC-2087] - Bump maxWireVersion for MongoDB 6.0
* [PHPC-2094] - Relay command comment when constructing a cursor
* [PHPC-2104] - EncryptOpts queryType should accept a string consistent with queryType in encryptedFields

** New Feature
* [PHPC-1899] - getServerConnectionId for command monitoring events
* [PHPC-2005] - Support 'let' option for multiple CRUD commands
* [PHPC-2049] - BulkWrite and Query support comment option of any type
* [PHPC-2085] - autoEncryption options for queryable encryption
* [PHPC-2092] - ClientEncryption options for queryable encryption
* [PHPC-2096] - Implement Manager::getEncryptedFieldsMap()
* [PHPC-2097] - Enable ClientEncryption constructor

** Task
* [PHPC-2053] - Remove mongodb.mock_service_id INI option
* [PHPC-2078] - Allow PECL release-upload.php to verify version constants
* [PHPC-2090] - Add MongoDB 5.0 to load balancer CI matrix

** Improvement
* [PHPC-2087] - Bump maxWireVersion for MongoDB 6.0
* [PHPC-2094] - Relay command comment when constructing a cursor

** Epic
* [PHPC-1150] - Support SDAM Monitoring

** New Feature
* [PHPC-1805] - Implement ServerDescription class
* [PHPC-1891] - Implement TopologyDescription class
* [PHPC-1892] - Define SDAMSubscriber interface
* [PHPC-1893] - Define SDAM event classes
* [PHPC-1900] - Allow custom service names with srvServiceName URI option
* [PHPC-1908] - Allow limiting mongos servers with srvMaxHosts option

** Task
* [PHPC-1342] - Add documentation warning against the use of duplicate key names
* [PHPC-1909] - Set minWireVersion to 6 (MongoDB 3.6)
* [PHPC-1953] - Create tests for event object debug handlers
* [PHPC-1958] - Ensure that getTopologyId() gives the same result for all SDAM events
* [PHPC-1959] - Change SDAM event tests to use Manager::addSubscriber()
* [PHPC-1973] - Bump maxWireVersion to 14 for MongoDB 5.1
* [PHPC-2008] - writeresult-getserver-002 fails to drop collection in local db on replicaset-auth
* [PHPC-2012] - Remove extra AX_CHECK_COMPILE_FLAG args
* [PHPC-2019] - Remove Solaris checks in m4 build scripts
* [PHPC-2022] - Use mongoc_host_list in event structs
* [PHPC-2023] - Allow observation of TopologyClosedEvent
* [PHPC-2028] - Replace PHONGO_ALLOC_OBJECT_T macro with zend_object_alloc
* [PHPC-2031] - Upgrade libmongoc to 1.21.1 and libmongocrypt to 1.3.2
* [PHPC-2034] - Bump maxWireVersion for MongoDB 5.2
* [PHPC-2036] - Remove outdated prose test in causal consistency spec
* [PHPC-2037] - Remove vim modeline comments
* [PHPC-2038] - Initialize zval in phongo_clientencryption_init
* [PHPC-2039] - Remove disabled debugging code in bson.c
* [PHPC-2040] - Break down php_phongo.c into smaller files
* [PHPC-2042] - Remove conditional win32/time.h include in UTCDateTime.c
* [PHPC-2047] - Update load balancer tests to support dedicated load balancer port
* [PHPC-2073] - Remove test environments and checks for pre-3.6 server versions
* [PHPC-2074] - Clarify in contributing docs that mongo-orchestration is not required to run tests

** Improvement
* [PHPC-1647] - Defer to libmongoc for cross-option URI validation
* [PHPC-1910] - Implement Server::getServerDescription
* [PHPC-1925] - ServerDescription::getType() should return a string
* [PHPC-1934] - Check for uninitialized intern in ServerDescription get_properties_hash
* [PHPC-1950] - Lift restriction on authSource without credentials when set in URI options array
* [PHPC-2003] - Expose whether a client session is dirty
* [PHPC-2025] - Support load balancer in ServerDescription and TopologyDescription
* [PHPC-2026] - Warn if ServerDescription::getLastUpdateTime() must be truncated
* [PHPC-2030] - Allow observation of commands issued during mongoc_client_destroy()
* [PHPC-2032] - Report more concise debug info for ended sessions

** New Feature
* [PHPC-2009] - Support tlsOptions encryption option

** Task
* [PHPC-1878] - Unexpected primary step down when testing on MongoDB latest
* [PHPC-1880] - Drop support for PHP 7.1
* [PHPC-1931] - Add PHP 8.1 to PHP toolchain
* [PHPC-1997] - Update calls to deprecated bson_atomic_int_add function
* [PHPC-2011] - Upgrade libmongoc to 1.20.0 and libmongocrypt to 1.3.0

** Improvement
* [PHPC-1942] - Support BSON Binary subtype 0x07 (column)
* [PHPC-2004] - Specify string return type in __toString() arginfos
* [PHPC-2007] - Explicitly implement Stringable for PHP 8+
* [PHPC-2010] - Type validation for autoEncryption.extraOptions

** Task
* [PHPC-1994] - Fix Evergreen builds for testing different libmongoc versions
* [PHPC-1995] - Use https:// instead of git:// for git clone

** Epic
* [PHPC-1752] - Load Balancer Support

** New Feature
* [PHPC-1849] - Handle deprecation of Serializable in PHP 8.1
* [PHPC-1889] - Support snapshot session option
* [PHPC-1890] - Create constant for snapshot read concern level
* [PHPC-1976] - Add load balancer serviceId to command monitoring events
* [PHPC-1978] - Expose libmongoc service ID mocking via INI option
* [PHPC-1980] - Create Server::TYPE_LOAD_BALANCER constant for use with Server::getType

** Task
* [PHPC-1897] - Test serialization of BSON with embedded null bytes in strings
* [PHPC-1918] - BSON corpus code and symbol tests are partially testing the wrong types
* [PHPC-1922] - Update PHONGO_CE_DISABLE_SERIALIZATION for PHP 8.1
* [PHPC-1930] - Remove disabled __wakeup() function in CursorId
* [PHPC-1935] - Add .dep files to .gitignore
* [PHPC-1961] - Regex decoding error tests in top.json have unexpected, invalid syntax
* [PHPC-1965] - Re-enable and stabilise PHP 8.1 build on GitHub actions
* [PHPC-1968] - Migrate Atlas testing from server 3.4 to 4.0
* [PHPC-1975] - Disable SKIPIF caching for skip_if_not_clean on PHP 8.1
* [PHPC-1977] - Add load balancer topology to Evergreen matrix
* [PHPC-1992] - Add load balanced serverless connectivity tests

** Improvement
* [PHPC-1538] - Lift restriction on authSource without credentials
* [PHPC-1858] - Add return type to arginfo for JsonSerializable::jsonSerialize() in PHP 8.1
* [PHPC-1875] - Disable writes on snapshot sessions
* [PHPC-1876] - Raise client error for snapshot sessions on pre-5.0 servers
* [PHPC-1933] - Add return type to arginfo for Iterator and Countable methods in PHP 8.1
* [PHPC-1937] - ReadPreference for Manager::selectServer() should be optional and default to primary
* [PHPC-1979] - Use mongoc_client_get_handshake_description for LoadBalancer server types
* [PHPC-1985] - Server::getLatency() should return null if unset

** Task
* [PHPC-1918] - BSON corpus code and symbol tests are partially testing the wrong types
* [PHPC-1922] - Update PHONGO_CE_DISABLE_SERIALIZATION for PHP 8.1
* [PHPC-1930] - Removed disabled __wakeup() function in CursorId
* [PHPC-1935] - Add .dep files to .gitignore
* [PHPC-1961] - Regex decoding error tests in top.json have unexpected, invalid syntax
* [PHPC-1965] - Re-enable and stabilise PHP 8.1 build on GitHub actions

** Improvement
* [PHPC-1538] - Lift restriction on authSource without credentials
* [PHPC-1858] - Add return type to arginfo for JsonSerializable::jsonSerialize() in PHP 8.1
* [PHPC-1875] - Disable writes on snapshot sessions
* [PHPC-1876] - Raise client error for snapshot sessions on pre-5.0 servers
* [PHPC-1933] - Add return type to arginfo for Iterator and Countable methods in PHP 8.1

** Epic
* [PHPC-1666] - Allow per-client event subscribers
* [PHPC-1731] - Versioned MongoDB API for Drivers
* [PHPC-1756] - Remove all oppressive and unnecessarily gendered language from driver projects

** New Feature
* [PHPC-1645] - Allow disabling of libmongoc client persistence
* [PHPC-1684] - Support Azure and GCP keystores in FLE
* [PHPC-1716] - Allow configuring ServerApi in Manager class
* [PHPC-1804] - Implement Manager::addSubscriber and removeSubscriber

** Task
* [PHPC-1513] - Remove php_phongo_cursor_to_zval
* [PHPC-1685] - Drop support for PHP 7.0
* [PHPC-1782] - Support Removal of Several Platform Builds
* [PHPC-1792] - Update copyright years in file headers
* [PHPC-1835] - Rotate credentials and environment vars for Atlas connectivity tests
* [PHPC-1841] - Remove oppressive language from the documentation
* [PHPC-1842] - Remove oppressive language from the source code
* [PHPC-1848] - Test against 5.0 servers
* [PHPC-1864] - Cut 5.0 Compat. GA Release
* [PHPC-1866] - Specify 5.0 cursor behaviour
* [PHPC-1872] - Fix server-executeQuery-008.phpt for RS config with arbiter
* [PHPC-1877] - MongoDB 5.0.0-rc2 cannot be downloaded on rhel71-power8

** Improvement
* [PHPC-1366] - Declare libbson vtable in MINIT instead of using a global
* [PHPC-1367] - Move libmongoc init/cleanup within scope of custom libbson vtable
* [PHPC-1474] - Expose transaction information in debug info for session
* [PHPC-1490] - Add support for var_export() and __set_state() in CursorId.c
* [PHPC-1681] - Support parsing $uuid as extended JSON representation for subtype 4 binary
* [PHPC-1737] - Use zend_hash_graceful_reverse_destroy to free persistent client HashTable
* [PHPC-1753] - Define error handling behavior of writeErrors and writeConcernError on Mongos
* [PHPC-1754] - Drivers should not inspect error messages for "not master" or "node is recovering"
* [PHPC-1762] - Expose the Reason an Operation Fails Document Validation
* [PHPC-1765] - Mitigate pain of using field names with dots and dollars
* [PHPC-1791] - Specify correct return type in __set_state protos
* [PHPC-1798] - Update serverSelectionTimeoutMS of MongoClient to mongocryptd
* [PHPC-1803] - Use "hello" command when API Version is declared
* [PHPC-1813] - Unpin session after aborting a transaction
* [PHPC-1821] - Driver Handling of DBRefs
* [PHPC-1836] - Remove slaveOK connection string option from URI parsing
* [PHPC-1840] - Use "hello" command for monitoring if supported
* [PHPC-1855] - Bump maxWireVersion for MongoDB 5.0

** Epic
* [PHPC-1731] - Versioned MongoDB API for Drivers

** New Feature
* [PHPC-1645] - Allow disabling of libmongoc client persistence

** Improvement
* [PHPC-1366] - Declare libbson vtable in MINIT instead of using a global
* [PHPC-1367] - Move libmongoc init/cleanup within scope of custom libbson vtable
* [PHPC-1681] - Support parsing $uuid as extended JSON representation for subtype 4 binary
* [PHPC-1684] - Support Azure and GCP keystores in FLE
* [PHPC-1716] - Allow configuring serverApi in manager class
* [PHPC-1737] - Use zend_hash_graceful_reverse_destroy to free persistent client HashTable
* [PHPC-1753] - Define error handling behavior of writeErrors and writeConcernError on Mongos
* [PHPC-1754] - Drivers should not inspect error messages for "not master" or "node is recovering"

** Task
* [PHPC-1739] - Move CI from travis-ci to GitHub Actions
* [PHPC-1808] - Upgrade libbson and libmongoc to 1.17.4

** Improvement
* [PHPC-1795] - Remove usages of xtrace in shell scripts

** New Feature
* [PHPC-1691] - Iterator implementation for MongoDB\Driver\Cursor

** Bug
* [PHPC-1167] - executeBulkWrite() may leave dangling session pointer on BulkWrite object
* [PHPC-1693] - Fix MongoDB\BSON\Regex::__construct() arginfo
* [PHPC-1697] - Fix MongoDB\Driver\Command::__construct() arginfo
* [PHPC-1698] - prep_tagsets may leak in convert_to_object
* [PHPC-1700] - prep_tagsets may leak if calling method errors

** Improvement
* [PHPC-479] - Print mongoc and libbson versions during configure
* [PHPC-1699] - Ensure all zpp errors are proxied by InvalidArgumentException
* [PHPC-1704] - Improve checks for built-in PHP extensions for Windows builds
* [PHPC-1706] - AIX platforms shouldn't try linking with libresolv

** Task
* [PHPC-169] - Test read and write concern inheritance
* [PHPC-1652] - Add timestamp test with high-order bit set that's not 2^32-1
* [PHPC-1653] - Resync BSON corpus spec tests
* [PHPC-1655] - Add a bson corpus test with invalid type for $code when $scope is also present
* [PHPC-1660] - Always refer to explicit version in PECL example for non-stable release notes
* [PHPC-1689] - Allow driver to compile with PHP 8
* [PHPC-1692] - Test suite fixes for PHP 8
* [PHPC-1694] - Add PHP 8 nightly to Travis CI build matrix
* [PHPC-1695] - Add PHP 8 to AppVeyor build matrix

** New Feature
* [PHPC-1691] - Iterator implementation for MongoDB\Driver\Cursor

** Improvement
* [PHPC-479] - Print mongoc and libbson versions during configure
* [PHPC-1699] - Ensure all zpp errors are proxied by InvalidArgumentException
* [PHPC-1704] - Improve checks for built-in PHP extensions for Windows builds

** Bug
* [PHPC-1167] - executeBulkWrite() may leave dangling session pointer on BulkWrite object
* [PHPC-1693] - Fix MongoDB\BSON\Regex::__construct() arginfo
* [PHPC-1697] - Fix MongoDB\Driver\Command::__construct() arginfo
* [PHPC-1698] - prep_tagsets may leak in convert_to_object

** Task
* [PHPC-169] - Test read and write concern inheritance
* [PHPC-1652] - Add timestamp test with high-order bit set that's not 2^32-1
* [PHPC-1653] - Resync BSON corpus spec tests
* [PHPC-1655] - Add a bson corpus test with invalid type for $code when $scope is also present
* [PHPC-1660] - Always refer to explicit version in PECL example for non-stable release notes
* [PHPC-1689] - Allow driver to compile with PHP 8
* [PHPC-1692] - Test suite fixes for PHP 8
* [PHPC-1694] - Add PHP 8 nightly to Travis CI build matrix
* [PHPC-1695] - Add PHP 8 to AppVeyor build matrix

** Epic
* [PHPC-1547] - PHPC MongoDB 4.4 Support

** New Feature
* [PHPC-1313] - Add support for Zstandard compression
* [PHPC-1483] - MONGODB-AWS Support
* [PHPC-1484] - Support for allowDiskUse on find operations
* [PHPC-1494] - Add client metadata support for wrapping libraries
* [PHPC-1533] - OCSP Support
* [PHPC-1554] - Unify behavior around configuration for replica set discovery
* [PHPC-1561] - Allow hinting the delete command
* [PHPC-1571] - Driver support for server Hedged Reads
* [PHPC-1575] - Add URI option to disable certificate revocation checking

** Task
* [PHPC-1060] - Automate Atlas connectivity tests
* [PHPC-1131] - Do not compile php.exe for Appveyor builds
* [PHPC-1384] - Specify behavior where connection string contain auth database but no credentials
* [PHPC-1401] - Add mongodb+srv URIs to Atlas Connectivity tests
* [PHPC-1440] - Bump wire protocol version for 4.4
* [PHPC-1442] - Remove support for PHP 5.6
* [PHPC-1525] - Deprecate oplogReplay find command option from CRUD spec
* [PHPC-1616] - Remove PHP 7.1 from AppVeyor build config
* [PHPC-1621] - Bundled libmongocrypt emits compiler warning
* [PHPC-1635] - Ensure OCSP and AWS auth are tested on both 4.4 and latest

** Improvement
* [PHPC-1478] - Support shorter SCRAM conversation
* [PHPC-1510] - Expand use of error labels for RetryableWrites
* [PHPC-1530] - Make ExceededTimeLimit retryable writes error
* [PHPC-1556] - Reduce Client Time To Recovery On Topology Changes
* [PHPC-1566] - Support speculative authentication attempts in isMaster
* [PHPC-1591] - Add tests for allowed cases when authSource is given but username is not
* [PHPC-1614] - Consult SIZEOF_ZEND_LONG instead of SIZEOF_LONG
* [PHPC-1615] - Specify obj_dir when adding sources in config.w32
* [PHPC-1628] - Clarify return type for WriteConcernError and WriteError getInfo() methods
* [PHPC-1629] - Call libmongoc is_valid functions before completing WriteConcern and ReadPreference initialization
* [PHPC-1632] - Reduce default keepalive time to align with Azure defaults

** Task
* [PHPC-1635] - Ensure OCSP and AWS auth are tested on both 4.4 and latest

** Improvement
* [PHPC-1556] - Reduce Client Time To Recovery On Topology Changes

** New Feature
* [PHPC-1313] - Add support for Zstandard compression
* [PHPC-1533] - OCSP Support
* [PHPC-1554] - Unify behavior around configuration for replica set discovery
* [PHPC-1571] - Driver support for server Hedged Reads
* [PHPC-1575] - Add URI option to disable certificate revocation checking

** Task
* [PHPC-1131] - Do not compile php.exe for Appveyor builds
* [PHPC-1384] - Specify behavior where connection string contain auth database but no credentials
* [PHPC-1616] - Remove PHP 7.1 from AppVeyor build config
* [PHPC-1621] - Bundled libmongocrypt emits compiler warning

** Improvement
* [PHPC-1566] - Support speculative authentication attempts in isMaster
* [PHPC-1591] - Add tests for allowed cases when authSource is given but username is not
* [PHPC-1614] - Consult SIZEOF_ZEND_LONG instead of SIZEOF_LONG
* [PHPC-1615] - Specify obj_dir when adding sources in config.w32
* [PHPC-1628] - Clarify return type for WriteConcernError and WriteError getInfo() methods
* [PHPC-1629] - Call libmongoc is_valid functions before completing WriteConcern and ReadPreference initialization
* [PHPC-1632] - Reduce default keepalive time to align with Azure defaults

** Task
* [PHPC-1060] - Automate Atlas connectivity tests
* [PHPC-1401] - Add mongodb+srv URIs to Atlas Connectivity tests
* [PHPC-1440] - Bump wire protocol version for 4.4
* [PHPC-1442] - Remove support for PHP 5.6
* [PHPC-1478] - Support shorter SCRAM conversation
* [PHPC-1510] - Expand use of error labels for RetryableWrites
* [PHPC-1525] - Deprecate oplogReplay find command option from CRUD spec

** Improvement
* [PHPC-1530] - Make ExceededTimeLimit retryable writes error
* [PHPC-1561] - Allow hinting the delete command

** Epic
* [PHPC-1293] - Support Client-side Field Level Encryption (FLE)

** New Feature
* [PHPC-1230] - Support object cloning for BSON classes
* [PHPC-1462] - Support ability to pass hint to update
* [PHPC-1491] - Add ReadPreference::getModeString
* [PHPC-1496] - Support compiling with libmongocrypt
* [PHPC-1497] - Introduce new configure switch to use system libraries
* [PHPC-1498] - Handle autoEncryptionOpts in MongoDB\Driver\Manager
* [PHPC-1499] - Add clientEncryption API
* [PHPC-1500] - Change serialisation of objects for client hash
* [PHPC-1539] - Create new exception classes for FLE

** Task
* [PHPC-952] - Refactor BSON type initiators for unserialization visitors
* [PHPC-1002] - Test regularly with C Driver release or release candidate
* [PHPC-1073] - Remove superfluous php_array_exists calls where possible
* [PHPC-1074] - Refactor php_phongo_bson_state struct initialization for debug output
* [PHPC-1269] - Document that BulkWrite instances may only be executed once
* [PHPC-1279] - Improve documentation for Cursor::isDead()
* [PHPC-1312] - Advise users to use 64-bit environments if possible
* [PHPC-1314] - Document that users may need to copy libsasl.dll to lib path for Windows installs
* [PHPC-1343] - Add test to catch inaccessible server when running tests
* [PHPC-1372] - Re-enable ARM64 builds in Evergreen matrix
* [PHPC-1424] - Inform users that mongodb.debug output contains sensitive information
* [PHPC-1426] - Update stubs for PhpStorm
* [PHPC-1430] - Deprecate obsolete driver options
* [PHPC-1438] - Expose more precise session state
* [PHPC-1445] - Make find commands for collecting libmongoc sources portable between Linux and macOS
* [PHPC-1449] - Resync bson-corpus array.json to fix duplicate test names
* [PHPC-1450] - Document rules by which TLS is implicitly enabled
* [PHPC-1461] - Remove Community zSeries From 4.0 testing
* [PHPC-1470] - Remove unnecessary timezone settings in tests
* [PHPC-1471] - Clean up reference handling in Javascript scope serialisation
* [PHPC-1472] - Prevent multiple exceptions from being thrown during manager serialisation
* [PHPC-1492] - Remove conditional EXPECTF patterns in UTCDateTime tests
* [PHPC-1532] - Document client-side encryption functionality
* [PHPC-1546] - Ensure Windows builds enable SASL and FLE

** Improvement
* [PHPC-870] - Consider using ZEND_HASH_FOREACH indirect macros for iteration
* [PHPC-966] - Explicitly initialize fields for internal class structs
* [PHPC-991] - Handle duplicates in URI options array
* [PHPC-1274] - Reset libmongoc client after forking to avoid interacting with parent resources in child processes
* [PHPC-1281] - Serialization support for ReadConcern, ReadPreference, and WriteConcern
* [PHPC-1284] - Driver session pools must be cleared after forking
* [PHPC-1347] - Do not allow empty string for replicaSet
* [PHPC-1391] - Prohibit starting a transaction for maxWireVersion < 7
* [PHPC-1411] - Accept 64-bit integers for wTimeoutMS
* [PHPC-1418] - Test PHP 7.3 in Evergreen
* [PHPC-1439] - Expose transaction options on session object
* [PHPC-1459] - Add serialisation support for CursorId
* [PHPC-1521] - Only warn in config.w32 if SASL is enabled but not available
* [PHPC-1545] - Require object or array type for "kmsProviders" option

** Task
* [PHPC-1504] - Add PHP 7.4 to AppVeyor build matrix
* [PHPC-1505] - Update to libmongoc 1.15.2

** Epic
* [PHPC-837] - Update PHP driver to test in Evergreen
* [PHPC-1112] - Test suite improvements
* [PHPC-1233] - FY2019Q3 Quick Wins
* [PHPC-1235] - PHPC MongoDB 4.2 Support
* [PHPC-1329] - Fix Windows build failures on AppVeyor

** New Feature
* [PHPC-1123] - Create interface for Cursor class
* [PHPC-1222] - Implement accessor for error labels on exception classes
* [PHPC-1231] - Add Session::isInTransaction to indicate whether a transaction is active
* [PHPC-1254] - Implement ObjectID spec
* [PHPC-1288] - Implement Unified URI Options
* [PHPC-1290] - Support mongos pinning for sharded transactions
* [PHPC-1291] - Retryable Reads
* [PHPC-1292] - Support polling SRV records for mongos discovery
* [PHPC-1297] - Support sharded transactions recovery token
* [PHPC-1319] - Drivers should use majority write concern when retrying commitTransaction
* [PHPC-1324] - Support Retryable Writes on by Default
* [PHPC-1355] - Add the ability to specify a pipeline to an update command
* [PHPC-1371] - Drivers send recoveryToken on abortTransaction
* [PHPC-1382] - Allow applications to set maxTimeMS for commitTransaction

** Task
* [PHPC-691] - Test that Server command/query execute methods send read preference to mongos
* [PHPC-857] - Create Evergreen matrix for various test configurations
* [PHPC-858] - Add authentication axis to Evergreen matrix
* [PHPC-859] - Add SSL axis to Evergreen matrix
* [PHPC-860] - Add PHP runtime axis to Evergreen matrix
* [PHPC-861] - Add MongoDB version axis to Evergreen matrix
* [PHPC-862] - Add Evergreen matrix to run against nightly server builds
* [PHPC-863] - Add RHEL 7.1/Power 8 to the operating system axis
* [PHPC-864] - Add storage engines to Evergreen matrix
* [PHPC-1122] - Check whether we still need SUPPRESS_UNUSED_WARNING
* [PHPC-1173] - Reimplement replica set seedlist tests
* [PHPC-1180] - Fix peer certificate verification errors for SSL clusters
* [PHPC-1219] - Relax requirement for replica set tagsets assertions
* [PHPC-1240] - Remove noprealloc, nssize and smallfiles from MO configurations
* [PHPC-1250] - Document the order in which skip_ifs in tests need to be done
* [PHPC-1271] - Add (only) RHEL on zSeries to Evergreen Matrix
* [PHPC-1275] - Bump wire protocol version for 4.2
* [PHPC-1276] - Create tool chain for PHP binaries
* [PHPC-1299] - Add Ubuntu 16.04/ARM64 to the operating system axis
* [PHPC-1320] - Regenerate test certificates with SHA256 signatures
* [PHPC-1333] - Revert to virtualized Travis CI environments
* [PHPC-1345] - Revise fragile session ID assertions
* [PHPC-1364] - Upgrade libmongoc to 1.14.0
* [PHPC-1369] - Upgrade libmongoc to 1.15.0
* [PHPC-1370] - Revise test assertion for unknown modifier error message
* [PHPC-1377] - Remove support for PHP 5.5
* [PHPC-1390] - Remove 7.0 and add 7.3 on AppVeyor
* [PHPC-1392] - Avoid spurious failure in ConnectionTimeoutException test due to slow auth
* [PHPC-1399] - Test MongoDB 4.2 in Evergreen
* [PHPC-1412] - Fix test failures when retryable writes are enabled
* [PHPC-1413] - Fix test failures executing insert on secondary
* [PHPC-1414] - Skip tests when mongo orchestration is not available
* [PHPC-1415] - Fix test failures for sharded cluster without replica set
* [PHPC-1428] - Bump libmongoc to 1.15.1

** Improvement
* [PHPC-1206] - Add __set_state() support for ReadConcern, ReadPreference, and WriteConcern
* [PHPC-1229] - Populate error labels for bulk write exceptions
* [PHPC-1301] - php_phongo_cursor_t.got_iterator should use bool type
* [PHPC-1307] - Exception interface should extend Throwable on PHP 7+
* [PHPC-1346] - Do not allow empty string for username
* [PHPC-1373] - WriteResult is inaccessible if executeBulkWrite() encounters socket error
* [PHPC-1394] - Don't send $readPreference to standalone servers
* [PHPC-1422] - Raise an actionable error message when retryWrites fails due to using an unsupported storage engine
* [PHPC-1431] - Session::startTransaction() should accept null for options

** Epic
* [PHPC-1235] - PHPC MongoDB 4.2 Support

** New Feature
* [PHPC-1254] - Implement ObjectID spec
* [PHPC-1288] - Implement Unified URI Options
* [PHPC-1290] - Support mongos pinning for sharded transactions

** Task
* [PHPC-1428] - Bump libmongoc to 1.15.1

** Improvement
* [PHPC-1346] - Do not allow empty string for username
* [PHPC-1431] - Session::startTransaction() should accept null for options

** Task
* [PHPC-1275] - Bump wire protocol version for 4.2
* [PHPC-1320] - Regenerate test certificates with SHA256 signatures
* [PHPC-1369] - Upgrade libmongoc to 1.15.0
* [PHPC-1377] - Remove support for PHP 5.5
* [PHPC-1390] - Remove 7.0 and add 7.3 on AppVeyor
* [PHPC-1392] - Avoid spurious failure in ConnectionTimeoutException test due to slow auth
* [PHPC-1399] - Test MongoDB 4.2 in Evergreen
* [PHPC-1412] - Fix test failures when retryable writes are enabled
* [PHPC-1413] - Fix test failures executing insert on secondary
* [PHPC-1414] - Skip tests when mongo orchestration is not available
* [PHPC-1415] - Fix test failures for sharded cluster without replica set

** Improvement
* [PHPC-1394] - Don't send $readPreference to standalone servers
* [PHPC-1422] - Raise an actionable error message when retryWrites fails due to using an unsupported storage engine

** Epic
* [PHPC-837] - Update PHP driver to test in Evergreen
* [PHPC-1329] - Fix Windows build failures on AppVeyor

** Task
* [PHPC-691] - Test that Server command/query execute methods send read preference to mongos
* [PHPC-857] - Create Evergreen matrix for various test configurations
* [PHPC-858] - Add authentication axis to Evergreen matrix
* [PHPC-859] - Add SSL axis to Evergreen matrix
* [PHPC-860] - Add PHP runtime axis to Evergreen matrix
* [PHPC-861] - Add MongoDB version axis to Evergreen matrix
* [PHPC-862] - Add Evergreen matrix to run against nightly server builds
* [PHPC-863] - Add RHEL 7.1/Power 8 to the operating system axis
* [PHPC-864] - Add storage engines to Evergreen matrix
* [PHPC-1180] - Fix peer certificate verification errors for SSL clusters
* [PHPC-1240] - Remove noprealloc, nssize and smallfiles from MO configurations
* [PHPC-1271] - Add (only) RHEL on zSeries to Evergreen Matrix
* [PHPC-1276] - Create tool chain for PHP binaries
* [PHPC-1299] - Add Ubuntu 16.04/ARM64 to the operating system axis
* [PHPC-1333] - Revert to virtualized Travis CI environments
* [PHPC-1345] - Revise fragile session ID assertions
* [PHPC-1364] - Upgrade libmongoc to 1.14.0
* [PHPC-1370] - Revise test assertion for unknown modifier error message

** Improvement
* [PHPC-1301] - php_phongo_cursor_t.got_iterator should use bool type
* [PHPC-1307] - Exception interface should extend Throwable on PHP 7+
* [PHPC-1373] - WriteResult is inaccessible if executeBulkWrite() encounters socket error

** Improvement
* [PHPC-1359] - Ensure 4.0 drivers return an error when attempting sharded transactions on 4.2

** New Feature
* [PHPC-1123] - Create interface for Cursor class
* [PHPC-1222] - Implement accessor for error labels on exception classes
* [PHPC-1231] - Add Session::isInTransaction to indicate whether a transaction is active

** Task
* [PHPC-1122] - Check whether we still need SUPPRESS_UNUSED_WARNING
* [PHPC-1173] - Reimplement replica set seedlist tests
* [PHPC-1219] - Relax requirement for replica set tagsets assertions
* [PHPC-1250] - Document the order in which skip_ifs in tests need to be done

** Improvement
* [PHPC-1206] - Add __set_state() support for ReadConcern, ReadPreference, and WriteConcern
* [PHPC-1229] - Populate error labels for bulk write exceptions

** Task
* [PHPC-1177] - Reimplement tests that use parse_url()
* [PHPC-1178] - Reimplement tests that load data fixtures
* [PHPC-1179] - Reimplement tests that start servers with Mongo Orchestration
* [PHPC-1209] - is_replica_set() should return false when connected to RS primary in standalone mode
* [PHPC-1220] - Create skip function for insufficient replica set members
* [PHPC-1225] - Add test to catch unsupported server wire protocol versions
* [PHPC-1258] - Bump system dependency on libbson and libmongoc in config.m4 to 1.12.0
* [PHPC-1263] - Update tests for PHP 7.3's output changes
* [PHPC-1270] - Upgrade libmongoc to 1.13.0

** Task
* [PHPC-1184] - Add alternative topologies to Travis CI
* [PHPC-1205] - Allow unencoded subdelimiters in usernames and passwords
* [PHPC-1227] - Document that transactions do not allow per-op read/write concerns
* [PHPC-1244] - Use majority WC to drop/create collections for transaction tests
* [PHPC-1246] - Document class tree for exception classes
* [PHPC-1248] - Add test to ensure that URI constant is successfully parsed
* [PHPC-1249] - Fix tests running against MongoDB 3.0 replicaset
* [PHPC-1251] - Upgrade libmongoc to 1.12.0

** Task
* [PHPC-1217] - Remind users to include __pclass field in projections
* [PHPC-1224] - Remove 2.6 servers from Travis CI

** New Feature
* [PHPC-314] - Implement type map syntax for documents within field paths
* [PHPC-578] - Expose result document for failed commands
* [PHPC-1076] - Expose result document for failed commands via CommandFailedEvent
* [PHPC-1087] - Introduce ServerException class
* [PHPC-1089] - Introduce CommandException class
* [PHPC-1105] - Implement SASLPrep
* [PHPC-1108] - SCRAM-SHA-256 Support
* [PHPC-1140] - Implement Transactions spec
* [PHPC-1153] - Handshake changes for SDAM and Auth
* [PHPC-1181] - Retryable writes should consider more errors retryable
* [PHPC-1211] - Create Int64 class to wrap 64-bit integers on 32-bit platforms

** Bug
* [PHPC-332] - Test that server selection throws ConnectionTimeoutException
* [PHPC-355] - Connection timeouts should throw ConnectionTimeoutException, and not RuntimeException
* [PHPC-1022] - Sporadic SCRAM-SHA-1 authentication failures due to "storedKey mismatch"
* [PHPC-1158] - Segfault during OpenSSL cleanup routines
* [PHPC-1166] - Update zend array recursion protection for PHP 7.3
* [PHPC-1169] - TLS renegotiation errors during heartbeat when using Secure Transport
* [PHPC-1195] - BulkWrite::update() should append arrayFilters option as array
* [PHPC-1196] - Raise client error if arrayFilters option is used when unsupported
* [PHPC-1198] - Ensure bundled libraries set CFLAGS correctly

** Task
* [PHPC-585] - Document maxTimeMS example for executeCommand and executeQuery
* [PHPC-759] - Ensure that the driver can be compiled as a built-in PHP extension
* [PHPC-1083] - Change "available" RP constant to use libmongoc's constant instead of hard coding it
* [PHPC-1088] - Deprecate SSLConnectionException
* [PHPC-1107] - Resync tests to update handling of inconsistent write concern
* [PHPC-1113] - Migrate tests to use a common URI environment variable
* [PHPC-1114] - Add template.rc file to embed the right MongoDB version in the Windows binary
* [PHPC-1118] - Create clang-format file and Makefile targets
* [PHPC-1121] - Test Windows builds on Appveyor
* [PHPC-1126] - Prohibit using unacknowledged writes with explicit sessions
* [PHPC-1132] - Remove HHVM checks in test suite
* [PHPC-1133] - Remove unused includes in SKIPIF and FILE sections
* [PHPC-1137] - Deprecate maxScan query option
* [PHPC-1138] - Deprecate snapshot option
* [PHPC-1143] - Select ServerException for MONGOC_ERROR_WRITE_CONCERN domain
* [PHPC-1144] - Use server-side error code for BulkWriteException
* [PHPC-1145] - Fix development build warnings for numeric type conversions
* [PHPC-1148] - Throw InvalidArgumentException if BulkWrite is executed multiple times
* [PHPC-1160] - Initialize bson_error_t structs to zero
* [PHPC-1174] - Upgrade bundled libbson and libmongoc to 1.10
* [PHPC-1185] - Remove support for Cyrus SASL search path
* [PHPC-1186] - Consolidate libbson and libmongoc build configs
* [PHPC-1188] - Use --coverage compiler/linker option for code coverage builds
* [PHPC-1191] - Don't allow coverage for static builds
* [PHPC-1193] - Upgrade bundled libbson and libmongoc to 1.11

** Improvement
* [PHPC-850] - Add var_export() support for ReadConcern, ReadPreference, and WriteConcern
* [PHPC-922] - Improve specificity in generic corrupt BSON exception message
* [PHPC-1090] - Clean up switch statements for exception class selection
* [PHPC-1091] - Ensure ExecutionTimeoutException selection only considers server error code
* [PHPC-1120] - Decrease likelihood of implicit session leaks
* [PHPC-1127] - Remove old Mongo Orchestration cluster tests
* [PHPC-1139] - Update algorithm for Kerberos hostname canonicalization
* [PHPC-1149] - php_phongo_dispatch_handlers() should break if exception is thrown
* [PHPC-1154] - Implement wild card syntax for typemap field paths
* [PHPC-1189] - Prefix maintainer/coverage configure options with "mongodb"
* [PHPC-1200] - Remove MD5 from ObjectID generation
* [PHPC-1216] - Always validate and apply wtimeoutMS in URI options array

** Task
* [PHPC-1168] - Advise macOS users to install using PECL
* [PHPC-1197] - Check for unistd.h when compiling bundled zLib

** Task
* [PHPC-1136] - Add Appveyor build status badge to readme
* [PHPC-1156] - Default to Secure Transport on macOS before OpenSSL
* [PHPC-1157] - Upgrade bundled libmongoc and libbson to 1.9.4
* [PHPC-1159] - Test on specific server versions in Travis CI

** Improvement
* [PHPC-1161] - Free reference to Session once Cursor is exhausted

** Task
* [PHPC-962] - Document example of tailable cursor iteration

** Task
* [PHPC-456] - Document caveats of serializing BSON document to arrays with type maps

** Epic
* [PHPC-934] - PHPC MongoDB 3.6 Support

** New Feature
* [PHPC-834] - Add Read, ReadWrite, and Write command execute methods
* [PHPC-967] - Add support for reading and writing OP_COMPRESSED
* [PHPC-975] - Array Update Improvements
* [PHPC-979] - OP_MSG support
* [PHPC-980] - Implement Drivers Sessions API
* [PHPC-986] - All writes retryable support
* [PHPC-987] - Causally Consistent Reads support
* [PHPC-993] - Parse localLogicalSessionTimeoutMinutes from isMaster response
* [PHPC-1015] - Implement Initial DNS Seedlist discovery spec
* [PHPC-1027] - Introduce classes for deprecated BSON types
* [PHPC-1029] - Support maxTimeMS getMore option for tailable command cursors
* [PHPC-1042] - Support options array for BulkWrite, Command, and Query execute methods
* [PHPC-1109] - Support batchSize getMore option for command cursors

** Task
* [PHPC-227] - Mongo Orchestration should restart when Vagrant test VM boots
* [PHPC-599] - Document 32-bit platform limitation for Timestamp arguments
* [PHPC-995] - Drop support for MongoDB 2.4
* [PHPC-1003] - Use container environment for Travis CI builds
* [PHPC-1013] - Test Driver Wire Version Overlap logic
* [PHPC-1024] - Document BSON exceptions for Cursor iteration
* [PHPC-1035] - Improve server compatibility error messages for wire version checks
* [PHPC-1036] - Update test suite for MongoDB 3.6
* [PHPC-1037] - Upgrade bundled libmongoc and libbson to 1.9
* [PHPC-1039] - Non data-bearing servers must be excluded when determining if a cluster supports sessions
* [PHPC-1047] - Add MongoDB 3.6 to test framework
* [PHPC-1048] - Rename phongo_execute_write to phongo_execute_bulk_write
* [PHPC-1055] - Improve docs for linking correct version of OpenSSL on macOS
* [PHPC-1065] - Enable BSON corpus tests for deprecated types
* [PHPC-1069] - Enable Coverity scans for the driver
* [PHPC-1070] - Create macro for accessing zval class or type name
* [PHPC-1077] - Fix X509 test failures with libmongoc 1.9.0 and MongoDB 3.6
* [PHPC-1078] - Create constant for available read concern level
* [PHPC-1079] - Document that jsonSerialize() returns legacy extended JSON
* [PHPC-1080] - Document new (deprecated) BSON classes
* [PHPC-1081] - Investigate Fedora build failures for 1.4.0beta1
* [PHPC-1082] - Add a PHP version check to config.m4
* [PHPC-1084] - Upgrade switch/case fallthrough comments to use GCC 7's new attribute
* [PHPC-1097] - Report libmongoc's compression engines in phpinfo() output
* [PHPC-1098] - Fix test failures due to floating point precision
* [PHPC-1100] - Fix test failures when driver is compiled without SSL

** Improvement
* [PHPC-709] - Debuglog timestamp does not contain micro/nanoseconds
* [PHPC-888] - Support additional TLS libraries for bundled libmongoc
* [PHPC-969] - Have TCP keepalive default to true
* [PHPC-1031] - Run configure check to use ASN1_STRING_get0_data over ASN1_STRING_data in bundled libmongoc
* [PHPC-1071] - Report class name in exception for unexpected object values

** New Feature
* [PHPC-1109] - Support batchSize getMore option for command cursors

** Task
* [PHPC-227] - Mongo Orchestration should restart when Vagrant test VM boots
* [PHPC-962] - Document example of tailable cursor iteration
* [PHPC-1003] - Use container environment for Travis CI builds
* [PHPC-1013] - Test Driver Wire Version Overlap logic
* [PHPC-1024] - Document BSON exceptions for Cursor iteration
* [PHPC-1065] - Enable BSON corpus tests for deprecated types
* [PHPC-1069] - Enable Coverity scans for the driver
* [PHPC-1077] - Fix X509 test failures with libmongoc 1.9.0 and MongoDB 3.6
* [PHPC-1078] - Create constant for available read concern level
* [PHPC-1079] - Document that jsonSerialize() returns legacy extended JSON
* [PHPC-1080] - Document new (deprecated) BSON classes
* [PHPC-1081] - Investigate Fedora build failures for 1.4.0beta1
* [PHPC-1082] - Add a PHP version check to config.m4
* [PHPC-1084] - Upgrade switch/case fallthrough comments to use GCC 7's new attribute
* [PHPC-1097] - Report libmongoc's compression engines in phpinfo() output
* [PHPC-1098] - Fix test failures due to floating point precision
* [PHPC-1100] - Fix test failures when driver is compiled without SSL

** Improvement
* [PHPC-888] - Support additional TLS libraries for bundled libmongoc

** Epic
* [PHPC-934] - PHPC MongoDB 3.6 Support

** New Feature
* [PHPC-967] - Add support for reading and writing OP_COMPRESSED
* [PHPC-975] - Array Update Improvements
* [PHPC-979] - OP_MSG support
* [PHPC-980] - Implement Drivers Sessions API
* [PHPC-986] - All writes retryable support
* [PHPC-987] - Causally Consistent Reads support
* [PHPC-993] - Parse localLogicalSessionTimeoutMinutes from isMaster response
* [PHPC-1015] - Implement Initial DNS Seedlist discovery spec
* [PHPC-1027] - Introduce classes for deprecated BSON types
* [PHPC-1029] - Support maxTimeMS getMore option for tailable command cursors
* [PHPC-1042] - Support options array for BulkWrite, Command, and Query execute methods

** Task
* [PHPC-599] - Document 32-bit platform limitation for Timestamp arguments
* [PHPC-834] - Add Read, ReadWrite, and Write command execute methods
* [PHPC-995] - Drop support for MongoDB 2.4
* [PHPC-1035] - Improve server compatibility error messages for wire version checks
* [PHPC-1036] - Update test suite for MongoDB 3.6
* [PHPC-1037] - Upgrade bundled libmongoc and libbson to 1.9
* [PHPC-1039] - Non data-bearing servers must be excluded when determining if a cluster supports sessions
* [PHPC-1047] - Add MongoDB 3.6 to test framework
* [PHPC-1048] - Rename phongo_execute_write to phongo_execute_bulk_write
* [PHPC-1070] - Create macro for accessing zval class or type name

** Improvement
* [PHPC-709] - Debuglog timestamp does not contain micro/nanoseconds
* [PHPC-969] - Have TCP keepalive default to true
* [PHPC-1031] - Run configure check to use ASN1_STRING_get0_data over ASN1_STRING_data in bundled libmongoc
* [PHPC-1071] - Report class name in exception for unexpected object values

** Task
* [PHPC-1044] - Upgrade libbson and libmongoc to 1.8.2

** Epic
* [PHPC-909] - Spring cleaning for 1.3.0

** New Feature
* [PHPC-349] - Application Performance Monitoring (APM)
* [PHPC-382] - Allow zval_to_bson() to return the ID irrespective of ID generation
* [PHPC-471] - BulkWrite::insert() should always return the document's ID
* [PHPC-587] - CursorId should serialize to BSON as 64-bit integer
* [PHPC-772] - Parse authMechanism options in URI options array
* [PHPC-839] - Add option maxAwaitTimeMS on getMore commands
* [PHPC-926] - Implement Extended JSON spec
* [PHPC-976] - Create isDefault() method for read and write concerns
* [PHPC-985] - Implement Timestamp::getIncrement() and getTimestamp() methods
* [PHPC-988] - PHP 5.x segfault if TypeWrapper::createFromBSONType() throws exception

** Task
* [PHPC-302] - Throw exceptions for unsupported BSON types
* [PHPC-640] - Implement interfaces for userland BSON type classes
* [PHPC-765] - Connection string spec compliance
* [PHPC-892] - Upgrade libbson and libmongoc to 1.6.0
* [PHPC-907] - Remove PHONGO_API macro for exported symbols
* [PHPC-908] - Do not declare MINIT functions for each driver class
* [PHPC-910] - Reorganize BSON encoding and decoding sources
* [PHPC-911] - Prefix symbols and use static decls whenever possible
* [PHPC-915] - Document precedence of authMechanismProperties URI option over named GSSAPI options
* [PHPC-928] - Sync release files in PECL package generation script
* [PHPC-929] - Skip BSON corpus test for embedded null in code string
* [PHPC-932] - Remove reference to Manager on Cursor, Server, and WriteResult objects
* [PHPC-953] - Do not parse undocumented "database" key in URI options array
* [PHPC-957] - Use libmongoc constants for applicable URI options
* [PHPC-959] - Do not check for null return from mongoc_collection_find_with_opts()
* [PHPC-977] - Upgrade libbson and libmongoc to 1.7.0
* [PHPC-992] - Rename to[Canonical|Relaxed]JSON() to to[Canonical|Relaxed]ExtendedJSON()
* [PHPC-996] - Remove support for PHP 5.4
* [PHPC-997] - Update date/time handling code due to changes in timelib
* [PHPC-1004] - Rename ObjectID to ObjectId
* [PHPC-1007] - Upgrade libbson and libmongoc to 1.8.0
* [PHPC-1008] - Use SETUP_OPENSSL() in config.w32 if available

** Improvement
* [PHPC-579] - Throw exception for invalid BulkWrite::update() newObj argument
* [PHPC-628] - executeBulkWrite() should throw InvalidArgumentException for empty BulkWrite
* [PHPC-846] - Throw if maxStalenessSeconds URI option is out of range
* [PHPC-887] - Throw exceptions for unexpected types in URI options array
* [PHPC-904] - ReadPreference constructor should accept strings
* [PHPC-930] - Do not throw exceptions for critical and error levels in libmongoc log callback
* [PHPC-935] - Validate filter and options in Query constructor
* [PHPC-937] - Cursor::setTypeMap() and toPHP() should return early if type map is invalid
* [PHPC-941] - Introduce API for converting BSON to canonical and relaxed extended JSON
* [PHPC-942] - Use mongoc_uri_new_with_error() to improve URI error reporting
* [PHPC-944] - MONGOC_ERROR_COMMAND_INVALID_ARG should yield InvalidArgumentException
* [PHPC-1001] - Report field name for invalid UTF-8 and unsupported zval types during BSON encoding

** Task
* [PHPC-1008] - Use SETUP_OPENSSL() in config.w32 if available

** Task
* [PHPC-996] - Remove support for PHP 5.4
* [PHPC-997] - Update date/time handling code due to changes in timelib
* [PHPC-1004] - Rename ObjectID to ObjectId
* [PHPC-1007] - Upgrade libbson and libmongoc to 1.8.0
* [PHPC-1008] - Use SETUP_OPENSSL() in config.w32 if available

** Improvement
* [PHPC-1001] - Report field name for invalid UTF-8 and unsupported zval types during BSON encoding

** Task
* [PHPC-997] - Update date/time handling code due to changes in timelib

** Epic
* [PHPC-909] - Spring cleaning for 1.3.0

** New Feature
* [PHPC-349] - Application Performance Monitoring (APM)
* [PHPC-382] - Allow zval_to_bson() to return the ID irrespective of ID generation
* [PHPC-471] - BulkWrite::insert() should always return the document's ID
* [PHPC-587] - CursorId should serialize to BSON as 64-bit integer
* [PHPC-772] - Parse authMechanism options in URI options array
* [PHPC-839] - Add option maxAwaitTimeMS on getMore commands
* [PHPC-926] - Implement Extended JSON spec
* [PHPC-976] - Create isDefault() method for read and write concerns
* [PHPC-985] - Implement Timestamp::getIncrement() and getTimestamp() methods
* [PHPC-988] - PHP 5.x segfault if TypeWrapper::createFromBSONType() throws exception

** Task
* [PHPC-302] - Throw exceptions for unsupported BSON types
* [PHPC-640] - Implement interfaces for userland BSON type classes
* [PHPC-765] - Connection string spec compliance
* [PHPC-892] - Upgrade libbson and libmongoc to 1.6.0
* [PHPC-907] - Remove PHONGO_API macro for exported symbols
* [PHPC-908] - Do not declare MINIT functions for each driver class
* [PHPC-910] - Reorganize BSON encoding and decoding sources
* [PHPC-911] - Prefix symbols and use static decls whenever possible
* [PHPC-915] - Document precedence of authMechanismProperties URI option over named GSSAPI options
* [PHPC-928] - Sync release files in PECL package generation script
* [PHPC-929] - Skip BSON corpus test for embedded null in code string
* [PHPC-932] - Remove reference to Manager on Cursor, Server, and WriteResult objects
* [PHPC-953] - Do not parse undocumented "database" key in URI options array
* [PHPC-957] - Use libmongoc constants for applicable URI options
* [PHPC-959] - Do not check for null return from mongoc_collection_find_with_opts()
* [PHPC-977] - Upgrade libbson and libmongoc to 1.7.0
* [PHPC-992] - Rename to[Canonical|Relaxed]JSON() to to[Canonical|Relaxed]ExtendedJSON()

** Improvement
* [PHPC-579] - Throw exception for invalid BulkWrite::update() newObj argument
* [PHPC-628] - executeBulkWrite() should throw InvalidArgumentException for empty BulkWrite
* [PHPC-846] - Throw if maxStalenessSeconds URI option is out of range
* [PHPC-887] - Throw exceptions for unexpected types in URI options array
* [PHPC-904] - ReadPreference constructor should accept strings
* [PHPC-930] - Do not throw exceptions for critical and error levels in libmongoc log callback
* [PHPC-935] - Validate filter and options in Query constructor
* [PHPC-937] - Cursor::setTypeMap() and toPHP() should return early if type map is invalid
* [PHPC-941] - Introduce API for converting BSON to canonical and relaxed extended JSON
* [PHPC-942] - Use mongoc_uri_new_with_error() to improve URI error reporting
* [PHPC-944] - MONGOC_ERROR_COMMAND_INVALID_ARG should yield InvalidArgumentException

** Task
* [PHPC-411] - Drop system.profile collection before tests

** Task
* [PHPC-736] - Remove zend_str_tolower_dup() in ObjectID construction
* [PHPC-825] - Document URI options array for Manager constructor
* [PHPC-906] - Make test suite compatible with libbson/libmongoc 1.5.0 and 1.6.0

** Task
* [PHPC-897] - Document that connections are initialized lazily
* [PHPC-899] - Remind users about BSON comparison behavior

** Improvement
* [PHPC-635] - WriteResult debug handler should return objects
* [PHPC-873] - Do not allow mixing bundled and system libbson and libmongoc libraries

** Task
* [PHPC-633] - Add lines to phpinfo() output regarding support for SSL and SASL
* [PHPC-714] - Implement BSON corpus test suite
* [PHPC-890] - Add license header to source files

** Epic
* [PHPC-542] - Remove dependency on mongoc private symbols

** Improvement
* [PHPC-359] - Ensure read preference tags sets serialize as documents
* [PHPC-424] - Validate that read preference tag set is an array of documents
* [PHPC-433] - Persist topology state between requests
* [PHPC-486] - Add syntax highlighting to BSON persistence articles
* [PHPC-637] - Remind users that connection URIs should be encoded
* [PHPC-654] - Implement comparison handlers for BSON types
* [PHPC-676] - Do not allow BulkWrite objects to be executed multiple times
* [PHPC-684] - Report bypassDocumentValidation in BulkWrite debug output
* [PHPC-705] - Do not unnecessarily wrap filters in $query
* [PHPC-721] - Javascript constructor should throw if code contains null bytes
* [PHPC-724] - Regex constructor should throw if pattern or flags contain null bytes
* [PHPC-726] - Allow cross-platform serialization of Timestamp and UTCDateTime
* [PHPC-731] - Parse Timestamp argument as strings to accept large integers
* [PHPC-739] - Rename "javascript" to "code" in Javascript BSON class
* [PHPC-741] - Use consistent exceptions for BSON initialization methods
* [PHPC-742] - Regex constructor should default flags arg to empty string
* [PHPC-744] - Improve error messages for invalid Decimal128 and ObjectID strings
* [PHPC-746] - Default Manager URI to "mongodb://127.0.0.1/"
* [PHPC-754] - Remove libmongoc-priv system dependency in config.m4
* [PHPC-755] - Remove include of private mongoc-trace.h

** New Feature
* [PHPC-459] - BSON objects should implement JsonSerializable
* [PHPC-460] - BSON classes should support PHP serialization and var_export()
* [PHPC-498] - ReadPreference, ReadConcern, and WriteConcern should serialize to BSON
* [PHPC-536] - UTCDateTime constructor should default to current time and accept DateTimeInterface
* [PHPC-552] - Implement ObjectID::getTimestamp() method
* [PHPC-619] - Implement Decimal 128 type spec
* [PHPC-716] - Support new readConcern level "linearizable"
* [PHPC-729] - Implement __toString() method for Javascript and Binary
* [PHPC-730] - Implement getCode() and getScope() for Javascript
* [PHPC-734] - Support providing collation per operation
* [PHPC-752] - Allow users to set a limit on acceptable staleness
* [PHPC-757] - Implement The MongoDB Handshake Protocol
* [PHPC-786] - Support appname in URI array options

** Question
* [PHPC-723] - Blocking connect() leads to cumulative timeouts for multiple inaccessible servers

** Task
* [PHPC-313] - BSON should throw when encountering 64-bit integer on 32-bit platform
* [PHPC-416] - Document SSL options
* [PHPC-504] - Document how RP, RC, and WC are serialized to BSON
* [PHPC-533] - Remove PHONGO_API macro for exported functions
* [PHPC-584] - Remove MkDocs documentation in favor of PHP.net documentation
* [PHPC-600] - Manager::getServers() should use mongoc_client_get_server_descriptions()
* [PHPC-601] - Cursor::getServer() should not access mongoc_cursor_t.client
* [PHPC-602] - Create command cursors with mongoc_cursor_new_from_command_document()
* [PHPC-603] - Use mongoc_read_prefs_t getters instead of accessing struct fields directly
* [PHPC-604] - WriteConcern::getJournal() should use mongoc_write_concern_journal_is_set()
* [PHPC-605] - Rely on libmongoc's socket handling and SSL implementation
* [PHPC-606] - Use mongoc_server_description_t public API
* [PHPC-607] - Manager::selectServer() should use mongoc_client_select_server()
* [PHPC-609] - Ensure client URI handling uses libmongoc public API
* [PHPC-610] - Client construction should use mongoc_write_concern_is_valid()
* [PHPC-611] - WriteResult::isAcknowledged() should use mongoc_write_concern_is_acknowledged()
* [PHPC-618] - Implement SDAM Monitoring spec
* [PHPC-629] - Upgrade libbson and libmongoc to 1.4.0
* [PHPC-630] - Update bson_visitor_t for unsupported type function pointer
* [PHPC-653] - Document WriteResult, WriteConcernError, and WriteError classes
* [PHPC-659] - Update bson_visitor_t for decimal 128 type function pointer
* [PHPC-662] - Use mongoc_bulk_operation_get_hint()
* [PHPC-663] - Use mongoc_bulk_operation_get_write_concern()
* [PHPC-664] - Use mongoc_write_concern_get_w()
* [PHPC-665] - Remove private libmongoc and libbson header includes
* [PHPC-680] - BulkWrite::count() should return number of operations instead of estimated round-trips
* [PHPC-682] - Do not use mongoc_bulk_operation_t private API in BulkWrite debug handler
* [PHPC-687] - Consolidate struct definitions for PHP 5 and 7
* [PHPC-688] - Do not use mongoc_cursor_t private API in Cursor debug handler
* [PHPC-689] - Query and command execution should use mongoc_cursor_set_hint()
* [PHPC-703] - Update configure scripts for upstream SSL changes
* [PHPC-704] - Do not set "mongodb.debug" based on Manager's $driverOptions["debug"]
* [PHPC-708] - Port http://php.net/manual/en/mongo.security.php to the new docs/driver
* [PHPC-718] - Define extension dependencies
* [PHPC-751] - Document MongoDB\BSON\Decimal128
* [PHPC-758] - Disable Decimal128 for bundled libbson and libmongoc 1.4.0
* [PHPC-761] - Remove BSON_NAMESPACE constant
* [PHPC-769] - Javascript serialization, export, and dump should always include scope field
* [PHPC-777] - Document MongoDB\Driver\ReadConcern::LINEARIZABLE
* [PHPC-779] - Switch serialization from O type to C type
* [PHPC-780] - Document persistent connection behavior
* [PHPC-783] - Use mongoc_collection_find_with_opts() for Query execution
* [PHPC-789] - Remove __wakeup from BSON/* classes
* [PHPC-791] - Upgrade libbson and libmongoc to 1.5.0
* [PHPC-796] - Use flexible opts for BulkWrite update and delete
* [PHPC-799] - Create notice for all third party libraries
* [PHPC-805] - Query "partial" option is now "allowPartialResults"
* [PHPC-806] - Document Query options for mongoc_collection_find_with_opts()
* [PHPC-807] - Document "collation" option for Query and BulkWrite update/delete
* [PHPC-824] - SDAM spec update : Update the topology from each handshake
* [PHPC-826] - Document that socket paths must be URL-encoded
* [PHPC-827] - Update Max Staleness implementation
* [PHPC-829] - BSON Regex flags must be alphabetically ordered

** Improvement
* [PHPC-424] - Validate that read preference tag set is an array of documents
* [PHPC-705] - Do not unnecessarily wrap filters in $query

** New Feature
* [PHPC-498] - ReadPreference, ReadConcern, and WriteConcern should serialize to BSON
* [PHPC-734] - Support providing collation per operation
* [PHPC-752] - Allow users to set a limit on acceptable staleness

** Task
* [PHPC-783] - Use mongoc_collection_find_with_opts() for Query execution
* [PHPC-796] - Use flexible opts for BulkWrite update and delete

** Improvement
* [PHPC-433] - Persist topology state between requests
* [PHPC-726] - Allow cross-platform serialization of Timestamp and UTCDateTime
* [PHPC-731] - Parse Timestamp argument as strings to accept large integers
* [PHPC-742] - Regex constructor should default flags arg to empty string
* [PHPC-744] - Improve error messages for invalid Decimal128 and ObjectID strings

** New Feature
* [PHPC-552] - Implement ObjectID::getTimestamp() method
* [PHPC-716] - Support new readConcern level "linearizable"
* [PHPC-757] - Implement The MongoDB Handshake Protocol
* [PHPC-786] - Support appname in URI array options

** Task
* [PHPC-605] - Rely on libmongoc's socket handling and SSL implementation
* [PHPC-629] - Upgrade libbson and libmongoc to 1.4.0
* [PHPC-704] - Do not set "mongodb.debug" based on Manager's $driverOptions["debug"]
* [PHPC-761] - Remove BSON_NAMESPACE constant
* [PHPC-769] - Javascript serialization, export, and dump should always include scope field
* [PHPC-779] - Switch serialization from O type to C type
* [PHPC-789] - Remove __wakeup from BSON/* classes

** Improvement
* [PHPC-486] - Add syntax highlighting to BSON persistence articles
* [PHPC-684] - Report bypassDocumentValidation in BulkWrite debug output
* [PHPC-721] - Javascript constructor should throw if code contains null bytes
* [PHPC-724] - Regex constructor should throw if pattern or flags contain null bytes
* [PHPC-739] - Rename "javascript" to "code" in Javascript BSON class
* [PHPC-741] - Use consistent exceptions for BSON initialization methods
* [PHPC-746] - Default Manager URI to "mongodb://127.0.0.1/"
* [PHPC-754] - Remove libmongoc-priv system dependency in config.m4
* [PHPC-755] - Remove include of private mongoc-trace.h

** New Feature
* [PHPC-460] - BSON classes should support PHP serialization and var_export()
* [PHPC-536] - UTCDateTime constructor should default to current time and accept DateTimeInterface
* [PHPC-619] - Implement Decimal 128 type spec
* [PHPC-729] - Implement __toString() method for Javascript and Binary
* [PHPC-730] - Implement getCode() and getScope() for Javascript

** Task
* [PHPC-600] - Manager::getServers() should use mongoc_client_get_server_descriptions()
* [PHPC-601] - Cursor::getServer() should not access mongoc_cursor_t.client
* [PHPC-602] - Create command cursors with mongoc_cursor_new_from_command_document()
* [PHPC-603] - Use mongoc_read_prefs_t getters instead of accessing struct fields directly
* [PHPC-604] - WriteConcern::getJournal() should use mongoc_write_concern_journal_is_set()
* [PHPC-606] - Use mongoc_server_description_t public API
* [PHPC-607] - Manager::selectServer() should use mongoc_client_select_server()
* [PHPC-609] - Ensure client URI handling uses libmongoc public API
* [PHPC-610] - Client construction should use mongoc_write_concern_is_valid()
* [PHPC-611] - WriteResult::isAcknowledged() should use mongoc_write_concern_is_acknowledged()
* [PHPC-630] - Update bson_visitor_t for unsupported type function pointer
* [PHPC-659] - Update bson_visitor_t for decimal 128 type function pointer
* [PHPC-662] - Use mongoc_bulk_operation_get_hint()
* [PHPC-663] - Use mongoc_bulk_operation_get_write_concern()
* [PHPC-664] - Use mongoc_write_concern_get_w()
* [PHPC-665] - Remove private libmongoc and libbson header includes
* [PHPC-680] - BulkWrite::count() should return number of operations instead of estimated round-trips
* [PHPC-682] - Do not use mongoc_bulk_operation_t private API in BulkWrite debug handler
* [PHPC-687] - Consolidate struct definitions for PHP 5 and 7
* [PHPC-688] - Do not use mongoc_cursor_t private API in Cursor debug handler
* [PHPC-689] - Query and command execution should use mongoc_cursor_set_hint()
* [PHPC-703] - Update configure scripts for upstream SSL changes
* [PHPC-708] - Port http://php.net/manual/en/mongo.security.php to the new docs/driver
* [PHPC-758] - Disable Decimal128 for bundled libbson and libmongoc 1.4.0