[issue14596] struct.unpack memory leak

[Mark Dickinson]

Mark Dickinson <dickinsm at gmail.com> added the comment:

> It appears the storage of Struct instances is rather inefficient when 
> there's a repeat code such as "<48L"

Right.  Repeat counts aren't directly supported in the underlying PyStructObject;  a format string containing repeat counts is effectively 'compiled' to a series of (type, offset, size) triples before it can be used.  The caching is there to save repeated compilations when the same format string is used repeatedly.

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<http://bugs.python.org/issue14596>
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