rails/rails — pull request #14801 by kuldeepaggarwal (2014-04-18 20:04:12+00:00)
Title: Fix inconsistent behavior from String#pluralize

```text
# Before:
When calling String#pluralize with count=1 then it returned same
string, but with count other than 1, returned new string.

# After:
String#pluralize always return a new string.

=> Prevent mutation of a string inadvertently.
```