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Description
We need to add support for updates to OpFromGraph, both explicit variable update dicts and SharedVariable.default_updates.
There are a few examples of this being done throughout AePPL and AeMCMC (e.g. aesara-devs/aemcmc#76), but we need to simplify and generalize that code.
N.B. This idea has been floating around since the beginning but, apparently, we didn't have an issue for it.