dmiller 55c7fb605f Improve performance of StringPool.unique ...

This saves a function call by using subclassing dict instead of using a
real dict. When a cache hit occurs, there is no overhead beyond a
standard dict lookup, which in most implementations is very fast. Cache
miss is similar performance to previous.

Also added a unittest for this functionality.

2014-01-15 15:37:25 +00:00

9.6 KiB

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