[issue39576] Surprising MemoryError in `decimal` with MAX_PREC

[Stefan Krah]

Stefan Krah <stefan at bytereef.org> added the comment:

BTW, this PR implements the invariant:

"If there exists an exact result at a lower precision, this
result should also be returned at MAX_PREC (without MemoryError)".

So non-integer powers are left out, since _decimal has no notion
of exact non-integer powers yet.

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