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e743742df1
There are several changes here: 1) When wrapping a callback interface object for JS, just extract the underlying JSObject from inside it and hand that object out. 2) Flag callback interface descriptors as "not concrete" (only matters for cases when they have constants on the interface object) and not wrappercached (will catch bugs if someone tries to treat them as a Gecko object). 3) Fix a preexisting bug in sequence wrapping where we'd try to JS_DefineElement twice if we were wrapping a null value for a sequence of nullable interface objects.