Probably 70fae1f made a double acounting of region-clients in smmap.mman.py#L136, where a "manual" increment_client_count() follows a _obtain_region() which it also increments the client-count.
From gitdb TC gitdb.test.test_pack:TestPack.test_pack_entity() I can see that this is indeed the case, where it is increased 2 x 3 times for 3 mmaps, while it is decremented just 3 times.
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Probably 70fae1f made a double acounting of region-clients in smmap.mman.py#L136, where a "manual" increment_client_count() follows a _obtain_region() which it also increments the client-count.
From gitdb TC gitdb.test.test_pack:TestPack.test_pack_entity() I can see that this is indeed the case, where it is increased 2 x 3 times for 3 mmaps, while it is decremented just 3 times.