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This is done by adding a variant to the XComArg mechanism so we can hook extra logic into
resolve()
at runtime.Some extra mechanism is added so we can continue to use XComArg like we do right now, but also prevent TransformedXComArg from needing to inherit a lot of the old XComArg nonsense like
__str__
and__getitem__
.Some validation is removed from the upstream that pushed the XCom, because with
map()
we can no longer be sure the XCom is “wrong” when the upstream finishes (we can only know in the downstream, after transform functions are applied).