>   It should also be emphasized that it isn't just a simple notion of
> cleaning up assumptions after yourself -- the cache interacts in quite an
> intertwined way. Under the right assumptions, expressions will be
> simplified, and variables will be assigned certain values. If that's stored
> in the cache, changing any related assumption will invalidate the result.

Why not make assumptions part of the hash of an object? At least to
the extent that the cache is concerned?

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