Moose -> Mouse -> Mouse::Tiny/Muscle

Some of you might have noticed that I'm making use of Mouse in writing
Test::Builder2.  Obviously, Test::Builder2 can't have this dependency for real
[1] but I want to see what happens when I have a real OO system.  Mouse is
nice in that it does 95% of what Moose does without the heavy overhead.
Before release it'll have to be torn out and replaced with something stand-alone.

I looked at just copying in Mouse, but Mouse has dependencies which themselves
have dependencies, some of them with XS.  Ideally, what I want is Mouse::Tiny,
or as I like to put it, "Muscle". [2]  A stand-alone, single file, no non-core
dependencies, 5.6 compatible implementation of 80% of Moose.  That way I can
just copy it into the Test::Builder2 distribution and have a real OO system.

So, anyone want to take a crack at this?  We can get a lot of millage out of
just has() (with is, isa and default) and extends().


[1] It would be circular, or they couldn't use any Test::Builder derived
    modules which is about everything these days.

[2] "musculus" ("muscle" in Latin) is the diminutive of "mus" ("mouse")
    "muscle" == "little mouse".


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