rails/rails — pull request #13321 by mezis (2013-12-14 10:17:46+00:00)
Title: Fixes interpolation on SafeBuffer

Interpolation was untested and did not work with hash arguments.

Adds
- support for interpolation with hash argument
- tests for the above
- tests for safe/unsafe interpolation

Original discussion in #13310 which was PRd to `4-0-stable`.