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There were a few things which were being reused consistently for
compatibility purposes, such as the `buffer`/`memoryview` functions
as well as the `izip` method which needed to be aliased for
Python 3. The `buffer` function was taken from `smmap` [1] and
reworked slightly to handle the optional third parameter.
This also adds a compatibility file dedicated entirely to encoding
issues, which seem to be the biggest problem. The main functions
were taken in part from the Django project [2] and rewritten
slightly because our needs are a bit more narrow.
A constants file has been added to consistently handle the
constants which are required for the gitdb project in the core
and the tests. This is part of a greater plan to reorganize
the `util.py` file included in this project.
This points the async extension back at the original repository
and points it to the latest commit.
[1]: https://github.com/Byron/smmap/blob/1af4b42a2354acbb53c7956d647655922658fd80/smmap/util.py#L20-L26
[2]: https://github.com/django/django/blob/b8d255071ead897cf68120cd2fae7c91326ca2cc/django/utils/encoding.py
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