#each iterator

[DanRathbun]

#each(), and #each_with_index() both simply return the collection for Enumerable objects.

But this is a bit weird, as the receiver is the TaskbarProgress object, and the enumerable collection is a parameter. I would still say not to make things work non-rubyish.
(A nitpick is that assigning a reference to the result of a block form method, and then returning it in the next statement is frivolous.)

If you want a block form that returns the ALL block results, it should be named collect(), alias map(), etc.; and select(), find_all(), etc. for filtered results.