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Transition to 2.10
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Overall
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Dropped support for Python 2.7 and 3.5 (pypy is also supported)

Bytes GreedyBytes can build from bytearrays (not just bytes)

Embedded and EmbeddedSwitch were permanently removed

Exceptions always display path information

build_file() opens a file for both reading and writing

BytesInteger BitsInteger can take lambda for swapped parameter
