rails/rails — pull request #17208 by huacnlee (2014-10-08 11:11:09+00:00)
Title: reduce allocations on ActiveView::Digestor.digest method.

Benchmark:

```
Calculating -------------------------------------
before with cache 6457 i/100ms
after with cache 6714 i/100ms
-------------------------------------------------
before with cache 96984.0 (±7.2%) i/s - 484275 in 5.019002s
after with cache 103156.9 (±8.5%) i/s - 516978 in 5.047322s

Comparison:
after with cache: 103156.9 i/s
before with cache: 96984.0 i/s - 1.06x slower
```