facebook/immutable-js — pull request #146 by briandipalma (2014-10-20 13:16:06+00:00)
Title: fix(ArraySequence.toArray): toArray should not allow the mutation of a S...

...equence

This might result in a performance hit when using toArray but I think this is not a case that the users should handle. It would mean leaking implementation details to users of immutable-js.