2.12.rc0

This feature release of the Ruby driver for MongoDB adds two major features:

1. Client-side encryption
2. Extended JSON parsing

The following notable improvements have been made:

• RUBY-1564 Support Client-side Field Level Encryption / FLE
• RUBY-1203 Implement Extended JSON functionality required for FLE
• RUBY-2142 Add filter option to Ruby list_collections method
• RUBY-1213 Cache SCRAM credentials
• RUBY-2091 Provide stack trace for ismaster failures in monitor
• RUBY-2162 Close sockets when connections fail
• RUBY-2172 Improve error reporting when nil and empty string are given to URI#get
• RUBY-1889 Auth exceptions now include server information
• RUBY-1151 Commands should have a limit of maxBsonObjectSize + 16K
• RUBY-2140 Socket liveness checks now time out

This release of the driver includes all bug fixes that are part of the 2.10-stable and 2.11-stable branches.