Allow functions to memoize themselves without being added to the query group. #334
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Allow functions to memoize themselves without being added to the query group.
This, in turn, lets us dismantle the God Object so that we don't need one giant struct with every function we ever dispatch to.
This, in turn, makes it potentially cheap and easy to use memoized functions from tests (we only need to set up the inputs), and makes it very simple to memoize expensive functions without refactoring all callers. (By convention, the first argument is always the db already!)
I'm not sold on the exact syntax -- in fact, I think it needs some work, and we should make it a proc macro wrapper thing so that we can apply it as an attribute and let rustfmt work, and even maybe to methods.