view .arcconfig @ 39035:cecb05c371f7

patchbomb: don't unintentionally duplicate headers

This dict-like of headers is only mostly dict-like: if you set a key
that already exists, you it appends another value, rather than
replacing the one that was already present.

This fixes test-patchbomb-bookmark.t on Python 3.

Differential Revision: https://phab.mercurial-scm.org/D4229

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