jdegoes/blueeyes — pull request #69 by non (2012-10-30 16:32:45+00:00)
Title: Add isEmpty, length, etc supporting JUndefined filtering

These methods suppor the kinds of tests people often want to do.

Given JUndefined I question the utility of allowing pattern-matching to destructure JArray and JObject, since in many cases the logic users use on the underlying collections will be incorrect (since it won't take JUndefined into account). But that is outside the scope of this commit.