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branchcache: add a "pure topological head" fast path...

branchcache: add a "pure topological head" fast path In a narrow but actually quick common case, all topological heads are all on the same branch and all open. In this case, computing the branch map is very simple. We can quickly detect situation where this situation will not change. So we update the V3 format to be able to express this situation and upgrade the update code to detect we remains in that mode. The branch cache is populated with the actual value when the branch map is accessed, but the update_disk method can do the update without needing to populate it.

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        Pulkit Goyal
    
thirdparty: vendor cbor2 python library...

              r37144
            
      .. image:: https://travis-ci.org/agronholm/cbor2.svg?branch=master

        :target: https://travis-ci.org/agronholm/cbor2

        :alt: Build Status

      .. image:: https://coveralls.io/repos/github/agronholm/cbor2/badge.svg?branch=master

        :target: https://coveralls.io/github/agronholm/cbor2?branch=master

        :alt: Code Coverage

      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).

      .. _RFC 7049: https://tools.ietf.org/html/rfc7049

      Project links

      -------------

      * `Documentation <http://cbor2.readthedocs.org/>`_

      * `Source code <https://github.com/agronholm/cbor2>`_

      * `Issue tracker <https://github.com/agronholm/cbor2/issues>`_

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Pulkit Goyal thirdparty: vendor cbor2 python library...	r37144	.. image:: https://travis-ci.org/agronholm/cbor2.svg?branch=master
		:target: https://travis-ci.org/agronholm/cbor2
		:alt: Build Status
		.. image:: https://coveralls.io/repos/github/agronholm/cbor2/badge.svg?branch=master
		:target: https://coveralls.io/github/agronholm/cbor2?branch=master
		:alt: Code Coverage

		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).

		.. _RFC 7049: https://tools.ietf.org/html/rfc7049

		Project links
		-------------

		* `Documentation <http://cbor2.readthedocs.org/>`_
		* `Source code <https://github.com/agronholm/cbor2>`_
		* `Issue tracker <https://github.com/agronholm/cbor2/issues>`_