The places I've seen this technique used (in C++), they make sure to remove the object's entry before the table can be consulted again. So it's sound.
Technically no, but LLVM doesn't define its behavior in the presence of signaling NaN, so they might as well be invalid.
There is. ASM.js uses tagged NaNs to represent null values. So at least one bit pattern will cause unexpected behavior if asm.js is used as the target for LLVM.
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