WASM: removed the in64-related bindings, as MDN says that calling a wasm function...

WASM: removed the in64-related bindings, as MDN says that calling a wasm function which has an int64 type in its signature will currently throw because JS has no 64-bit integer support. Those bindings now use doubles and simply hope that the user doesn't exceed their integer precision (2^53-1, approx 9 quadrillion).

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