Nick Coghlan <ncogh...@gmail.com> added the comment:

Read the "Releasing the buffer" section in PEP 3118 again. Unless I'm 
misunderstanding you completely, the rules you're asking for are already in 
place: those fields are entirely the responsibility of the exporting object, 
and it needs to ensure they remain valid until the buffer is released.

Now, it may be that we haven't *implemented* this correctly or consistently in 
the builtin objects, in which case we should do something about it. But the 
rules are there.

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<http://bugs.python.org/issue10181>
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