This issue bit us again recently.
In talking with some colleagues, I realized that the previous version
of this patch, in addition to being potentially slow, was incomplete.
Specifically, it didn't handle the case of refs/heads/case/one vs
refs/heads/CASE/two; these are case clones even though they strcasecmp
This new version contains code to prevent this, as well as tests for
Also it uses a hashmap to make lookups constant-time.
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