If you need small and fast itoa without allocations just use `itoa_buffered`

[MaxGraey]

import { itoa_buffered } from 'util/number';

export function itoa(dest: usize, value: i32): void {
  itoa_buffered(dest, value);
}

itoa_buffered - 256 bytes
fcrick/itoa - 323 bytes

https://webassembly.studio/?f=e9o931oi35j

One difference your version uses latin1/utf8 format. itoa_buffered uses UTF16 strings