There's a misunderstanding about stagnating proposals in TC39, that it's because TC39 dislikes a proposal. It's often not the proposal itself but the work of the champion. E.g. not enough research, poor presentation, lack of arguments or it's a topic which requires extra effort.
Ones that we already have: * |0 and the rest of the asm.js suite * Integer's cast
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I would love: * Guaranteed string interning * Explicit opt out of inlining * Explicit opt out in to lazy parsing Now that I think about it, these are JIT hints not type hints

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Stuff like String(foo) might already count as string annotations but I'm not sure if they're fast.
End of conversation
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