[[!comment format=mdwn
 username="joey"
 subject="""comment 2"""
 date="2016-07-12T19:55:52Z"
 content="""
In this case, the change only makes eg, "foo.ba__________r" not be considered
to have an extension of ".bar". So it's unlikely to affect many files.

I do try to keep the extension guessing code fairly stable to prevent breaking
re-adding. But sometimes a bug does warrant changing it.
"""]]