Wasm can do 64-bit integers, SIMD and statically typed GC classes.
JS could have had support for SIMD and 64 bit it's by now, and progress was actually being made (mostly just through the asm.js experiments), but it was deprioritized specifically to work on WASM.
WASM can even do 32-bit integers, which JavaScript can't, so uses floats instead.
JS could have had support for SIMD and 64 bit it's by now, and progress was actually being made (mostly just through the asm.js experiments), but it was deprioritized specifically to work on WASM.