[issue23935] Clean up Clinic's type expressions of buffers

[Larry Hastings]

Larry Hastings added the comment:

While cleaning this up I noticed that es# and et# should both require "nullable".  Fixed that too.  I sure hope it's all correct now!

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resolution:  -> fixed
stage: patch review -> resolved
status: open -> closed

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue23935>
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