Wrap memoized values in weak refs #846
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Memoized values only exist to speed up calculations, and are okay to be garbage-collected when memory pressure rises.
The
Wrapperis necessary in order to let the value pointed to by the weak ref behave exactly as the calculation result. In particular,nilis troublesome as it requires syntactic support from Ruby to be handled properly, and weak refs to nil don’t behave the same as nil itself.