Issue #7610: Reworked implementation of the internal
:class:`zipfile.ZipExtFile` class used to represent files stored inside
an archive. The new implementation is significantly faster and can
be wrapped in a :class:`io.BufferedReader` object for more speedups.
It also solves an issue where interleaved calls to `read()` and
`readline()` give wrong results. Patch by Nir Aides.
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