view .arcconfig @ 41565:bf7fb97aecf1

branchmap: make branchcache responsible for reading

Encapsulate reading in a classmethod, to make it clear what kind of object is
being handled.

This is part of a stack of refactoring changes to help performance improvements
down the line.

Differential Revision: https://phab.mercurial-scm.org/D5635

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