rails/rails — pull request #11559 by bughit (2013-07-22 18:31:10+00:00)
Title: don't convert mailer default values to procs

Invoke mailer defaults as procs only if they are procs, do not convert
with to_proc. That an object is convertible to a proc does not mean it's
meant to be always used as a proc. Fixes #11533