> I had no idea WASM is 32bit until I read your article!

WASM(32) is a hybrid 32/64 bit architecture. The address range (and thus pointer size) is 32 bits, but it has native 64-bit integers. E.g. it's similar to the Linux x32 ABI.

There is also a 'true' 64-bit wasm, but that's still too recent to be used in real-world code:

https://caniuse.com/wf-wasm-memory64

(but wasm64 doesn't really make sense unless you really need an address space greater than 32 bits, because the downside is slower performance)