This week 39 people contributed to Rails. We also got 11 first time contributors. Welcome aboard folks and keep it going!

Strong ETag is now available in addition to weak ETag. It implies that the response should be exactly the same and byte by byte identical. Useful when doing things like Range requests within a large video or PDF file.

Action Cable will gracefully disconnects clients and disables the monitor if the protocol has changed. This allows clients to gradually move to the newest version.

The record being validated is now accessible from the message proc to generate custom error messages like:
proc { |record, data| "#{data[:attribute]} failed with value #{record.name}." }

Need to format a non-US phone number? You can now use number_to_phone with the :pattern option as a Regexp.

There was an issue with Action Mailer when calling Sendmail with the -t argument. Sendmail would scan messages for recipients, and it could result in duplicated emails.

Previously, the method returned today's midnight time when there was no relevant information in the string. Now it returns nil.