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The previous approach was to re-implement Interpreter.parse() to iterate over cached tokens where possible. This proved to be a problem when the implementation changed in EmPy 4.x.
The approach implemented here is to create a shim between the Interpreter and Scanner API and record/inject the tokens there, which improves the compatibility by working only at the API boundary and not duplicating chunks of the upstream implementation.
Note that I haven't actually benchmarked either of these caching implementations. They may not be worth the complexity.