remotefilelog: actually fix (and test this time) a bytes vs str issue
I attempted this in 94670e124d29 but we didn't actually have any tests for this
function it seems, and I mistook "it works now" for it being fixed (when what
had actually happened was that my cache had populated enough that I didn't
trigger the minimum threshold on my reattempts).
Differential Revision: https://phab.mercurial-scm.org/D7785
Mercurial
=========
Mercurial is a fast, easy to use, distributed revision control tool
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$ make # see install targets
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$ hg debuginstall # sanity-check setup
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See https://mercurial-scm.org/ for detailed installation
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