Allow the implementation some flexibility when compiling patterns. about patma

[gvanrossum]

Allowing the number of calls to Foo.__match__ 8(with the same arg) etc. to vary seems fine to me. It should be a "pure function" of the target object anyway.

I think it's fine to do this even across multiple cases.

[Tobias-Kohn]

It might not necessarily be so much a question about the future of the CPython implementation as such. Rather, there are various Python implementation that work hard to optimise code, e.g. PyPy or Numba. By explicitly allowing for such optimisations, we are probably paving the way for some exciting work from these projects.