Added timeouts for connect, read, and write operations through --proxy-connect-timeout, --proxy-read-timeout, and --proxy-write-timeout options.

Added support for making connections to backends and clients using IPv6 addresses.

Added initial support for the Windows authentication plugin.

Added support for extracting pluggable authentication protocol information. In the Lua API, added these values: con.client.challenge.auth_plugin_name, con.client.response.auth_plugin_name.

Fixed handling of capability flags in the client authentication response. In the C API, network_mysqld_auth_response_new() needs the server-side capabilities. In the Lua API, added these values: con.client.challenge (mirrors con.server.challenge), con.client.response.server_capabilties, con.server.challenge.server_capabilities.

Fixed the length of auth-plugin-data in the client authentication response packet.

Fixed crash if the configfile value contained invalid characters. In the C API, added chassis_keyfile_to_options_with_error() and deprecated chassis_keyfile_to_options().

Fixed a crash if the --max-open-files value was invalid on Win32.

Fixed the default plugin_dir value for 64-bit Unix systems (lib64/ versus lib/).

Fixed a crash if COM_BINLOG_DUMP was used with rw-splitting.lua.

Fixed handling of a missing trailing \0 in MySQL 5.5.7 through MySQL 5.5.10 in the auth-method name.

Fixed abort() in COM_CHANGE_USER+auth-method-switch.

Fixed excessive buffering of LOAD DATA LOCAL INFILE data.

Fixed a lockup under very high load.