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filecache: use try-except for faster __dict__ lookup...
filecache: use try-except for faster __dict__ lookup Python function call is slow, and the cost could be significant here. $ hg perfrevset 'branch(tip)' -R mercurial (orig) wall 0.139511 comb 0.140000 user 0.140000 sys 0.000000 (best of 66) (this) wall 0.114195 comb 0.110000 user 0.110000 sys 0.000000 (best of 81)
Yuya Nishihara -
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/ mercurial / thirdparty / cbor
cbor2
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This library provides encoding and decoding for the Concise Binary Object Representation (CBOR) (RFC 7049) serialization format.

There exists another Python CBOR implementation (cbor) which is faster on CPython due to its C extensions. On PyPy, cbor2 and cbor are almost identical in performance. The other implementation also lacks documentation and a comprehensive test suite, does not support most standard extension tags and is known to crash (segfault) when passed a cyclic structure (say, a list containing itself).