view doc/README @ 48723:27fe84a8dd60

obsolete: always return frozensets from obsolete.getrevs()

getrevs function already returns an empty frozenset when there is no obsstore,
but let's make sure to return a frozenset in any case. This makes it possible
to use the result of this function as a dict key or provide it to hash()
built-in function without any conversions.

Differential Revision: https://phab.mercurial-scm.org/D12156

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