Improve error message for errant func registration #1677
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The observed behavior in the wild was that a double registration would complain (correctly), but reference
None
as the function id. Clearly not helpful. Improve the situation by referencing the cached value, but also relax the double-registration constraint slightly: if the calling code attempts to re-register the function with the same id, then that's odd -- so warn about it -- but let it go. Still raise the exception for other errant registration attempts.[sc-36241]
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