andrewdavey/immutable-object — pull request #4 by parshap (2014-04-15 21:31:34+00:00)
Title: Make `__isImmutableObject__` flag not enumerable

This changes `__isImmutableObject__` to be defined as a non-enumerable property
of the ImmutableObject prototype instead of being defined by assignment (which
results in an enumerable property).