[issue3660] reference leaks in 3.0

[Amaury Forgeot d'Arc]

Amaury Forgeot d'Arc <amauryfa at gmail.com> added the comment:

- the "test_site leaked [88, 88]" is the same as problem as issue3667.

- test_unicodes leaks in PyUnicode_AsEncodedString (attached patch), and
also with:
  str(memoryview(b'character buffers are decoded to unicode'), 'utf-8')
I tried another patch, but I'm not sure: I get lost between all these
buffers... a Py_DECREF(self->view.obj) in memory_releasebuf() seems to work.

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keywords: +patch
nosy: +amaury.forgeotdarc
Added file: http://bugs.python.org/file11285/encode-leak.patch

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<http://bugs.python.org/issue3660>
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