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changegroup: make delta header struct formatters actual structs...
changegroup: make delta header struct formatters actual structs Why we weren't using compiled Struct instances, I don't know. They make code simpler. In theory they are faster. Although I don't believe I was able to measure any meaningful change. That could be because this code is often dominated by compression, deltafication, and function call overhead. Differential Revision: https://phab.mercurial-scm.org/D4078

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README.rst
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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).