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extensions: gracefully warn when doing min version check with no local version...
extensions: gracefully warn when doing min version check with no local version After doing a `make clean`, I started getting cryptic failures to import extensions with the `minimumhgversion` attribute on py3: *** failed to import extension evolve: '>' not supported between instances of 'int' and 'NoneType' *** failed to import extension topic: '>' not supported between instances of 'int' and 'NoneType' This now handles the `(None, None)` tuple before comparing, and disables the extension with the same friendly message as in py2. Differential Revision: https://phab.mercurial-scm.org/D9363

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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).