swift234

Omit needless words: prepend "is" to Boolean property names.

Prepend       "is" to        Boolean property names (e.g., "empty" becomes
"isEmpty") unless the property name strongly indicates its Boolean
nature or we're   likely to ruin the name. Therefore, the  presence of
one of the following in  the property name will suppress   this
transformation:

* An auxiliary verb, such as "is", "has", "may", "should", or "will".

* A word ending in "s", indicating either a plural (for which
  prepending "is" would be incorrect) or a verb in the continuous
  tense (which indicates its Boolean nature, e.g., "translates" in
  "translatesCoordinates").

Swift SVN r32458