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Throw a JSException (modeling a TypeError) when passing nullexnref to JS. We had already handled throwing an error when passing a non-null exnref, but without handling nulls, SignatureRefining could optimize a exnref to a nullexnref on the boundary and change the throwing behavior. This was a bug in the interpreter rather than in the optimization pass.
Co-authored-by: Alon Zakai <azakai@google.com>
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Throw a JSException (modeling a TypeError) when passing nullexnref to
JS. We had already handled throwing an error when passing a non-null
exnref, but without handling nulls, SignatureRefining could optimize a
exnref to a nullexnref on the boundary and change the throwing behavior.
This was a bug in the interpreter rather than in the optimization pass.