Why do shared repos have independent branch caches?

[Michael O'Connor]

Does anyone know why repos produced with 'hg share' have branch caches that
are independent of the source repo?

I'm in a situation where rebuilding the caches takes significant time, and
the work is being duplicated across shared repos but I'm not sure why.

More concretely, in branchmap.py, why not have the _filename function check
if the repo has a sharedpath, and, if so, return the cache inside the repo
pointed to by sharedpath?

Thanks!
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