[issue4074] Building a list of tuples has non-linear performance

[Antoine Pitrou]

Antoine Pitrou <pitrou at free.fr> added the comment:

Now an additional patch which applies over the basic gctrigger4.patch.
It adds dict optimizations so that dicts with only atomic or immutable
elements are also untracked (they get tracked later when other trackable
elements are added).

Since dicts are often used as mappings of simple objects (int, str,
tuple) over other simple objects, this can be very useful.

Added file: http://bugs.python.org/file12383/dictopts.patch

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