symfony/symfony — pull request #3536 by johnnypeck (2012-03-09 08:24:53+00:00)
Title: Very small semantic changes improving understanding and readability.  

The "may or may not" change may seem pedantic but it quantifies the use of the field; obviously a boolean is true or not but "may not be empty" made me wonder about it's intent so clarification seemed appropriate.

Change "return" to "returns" as the rest of the code in the class uses this syntax.

Change "contains" to "contain" in an exception message.