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The current implementation of the attribute dictionary uses a custom hashtable. This modernizes the dictionary by converting it to the builtin 'hashmap' structure. Also, in order to enable a threaded API in the future add an accompanying mutex which must be acquired prior to accessing the dictionary of interned attributes. Signed-off-by: Brandon Williams <bmwill@google.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
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