[pypy-issue] Issue #2367: del bytearray[:n] should be optimized (pypy/pypy)

[Naoki INADA]

New issue 2367: del bytearray[:n] should be optimized
https://bitbucket.org/pypy/pypy/issues/2367/del-bytearray-n-should-be-optimized

Naoki INADA:

del bytearray[:n] is optimized from Python 3.4
ref: https://bugs.python.org/issue19087

AsyncIO uses bytearray for I/O buffers.
PyPy3 compatible to CPython 3.5 should have same optimization.