Moxie implements "topological memoization" with storage in its runtime.
TODO expand on this.
| memo | Memoizes init at this callsite, cloning a cached Stored if it exists and Arg is the same
as when the stored value was created.
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| memo_with | Memoizes the provided function, caching the intermediate Stored value in memoization storage
and only re-initializing it if Arg has changed since the cached value was created. Regardless
of prior cached results, with is then called in to produce a return value.
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| once | Runs the provided expression once per topo::Id. The provided value will always be cloned on
subsequent calls unless dropped from storage and reinitialized in a later Revision.
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| once_with | Memoizes expr once at the callsite. Runs with on every iteration.
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