Add the cmake option ENABLE_PIC to build static libraries with position independent code.
Fix possible int32 overflow when comparing and constructing large bson_t's.
Fix pedantic compiler warnings.
This release adds support for MongoDB 4.4 servers.
Support streamable server monitoring to reduce recovery time when the server topology changes.
Support the MONGODB-AWS authentication mechanism.
Support Online Certificate Status Protocol (OCSP).
Support configuring hedged reads in read preferences.
Reduce the number of round trips necessary for SCRAM and X509 authentication.
Monitor servers in parallel when using a mongoc_client_pool_t instead of doing serial scans.
Support the "hint" option in operations using the update, replace, delete, and findAndModify commands.
Improve behavior for retryable writes.
Improve resuming behavior of change streams on server errors.
Remove restriction of 255 character collection namespaces.
Fix criteria for resumable errors in change streams.
Fix rare crashes when server is invalidated during authentication.
Reject client session for mongoc_collection_estimated_document_count.
Fix behavior of a SecondaryPreferred read preference for exhaust cursor operations against a sharded cluster. Prior to the fix, a nonzero maxStalenessSeconds would not trigger sending the read preference.
Fix SRV polling. Prior to the fix, SRV polling did not properly apply newly discovered results.
Fix checks for existing GridFS indexes to handle indexes created by the MongoDB shell.
Fix possible use of invalidated streams during an unordered OP_QUERY bulk write, and when ending many pooled sessions at client destruction.
Fix a crash when setting the crl_file TLS option for Secure Channel.
Avoid emitting duplicate ServerChanged events when no change is observed during monitoring.
Properly handle large SASL messages instead of erroring.