[issue42454] Move slice creation to the compiler for constants

[Raymond Hettinger]

Raymond Hettinger <raymond.hettinger at gmail.com> added the comment:

Mostly, +1 from me as well.

If anything starts to rely on hashability, it will need a fallback path since slice objects are allowed to contain arbitrary objects (which might not themselves be hashable):   s = slice([], []).

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue42454>
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