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upgrade: remove unnecessary `is None` check...
upgrade: remove unnecessary `is None` check `upgrade_engine.upgrade()` always return the `backuppath` value and there are not early returns. Hence I don't see how `backuppath` can be None. Adding extra unncessary safe checks hides unknown bugs. Hence removing it. Differential Revision: https://phab.mercurial-scm.org/D9675

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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).