view .arcconfig @ 37864:890bdf0e33c8

shortest: extract function for checking if a prefix is a revnum

Much of isvalid() was about testing if a prefix is a valid revnum. I
want to reuse that soon, so let's move it out.

There is no significant slowdown from the function call overhead.

Differential Revision: https://phab.mercurial-scm.org/D3460

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    "base": "hg:.^"
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