040000 tree 9db1321f16a8256313a101776728d044702720a4	time.traits.duration_values
040000 tree 9ef96b8784f9b5067a70e106b7824e4f235a0ce4	time.traits.is_fp
040000 tree 6d9ce7ff8e20647bdea8485fda66e875f38f763e	time.traits.specializations