The MongoDB C Driver beta I announced two weeks ago has ripened into a release candidate. Here is what's changed between 1.3.0-beta0 and today's release, 1.3.0-rc0.

libbson

Parse DBRefs correctly from JSON.
CMake option to disable building tests: you can turn off ENABLE_TESTS.
Fix build warnings on some platforms.
The build system is refactored to declare the current version and latest release in one place.

mongoc_client_new, `mongoc_client_new_from_uri`, or `mongoc_client_pool_new`, the function logs an error and returns NULL. Before, the driver would attempt a non-SSL connection.
New functions to copy database and collection handles:

`mongoc_collection_copy`

`mongoc_database_copy`

If a GridFS chunk is missing, `mongoc_gridfs_file_readv` set the file's error to domain MONGOC_ERROR_GRIDFS and a new code MONGOC_ERROR_GRIDFS_CHUNK_MISSING.

Use electionId to detect a stale replica set primary during a network split.

Disconnect from replica set members whose "me" field does not match the connection address.

The client side matching feature, `mongoc_matcher_t` and related functions, are deprecated and scheduled for removal in version 2.0.

New CMake options: ENABLE_SSL, ENABLE_SASL, ENABLE_TESTS, and ENABLE_EXAMPLES.

Other fixes:

Memory leaks in `mongoc_database_has_collection` and `mongoc_cursor_next`.

Report writeConcern failures from findAndModify and from legacy writes.