Polyfill is slow

[ChALkeR]

This is about 10x slower than @exodus/bytes TextDecoder polyfill

On non-Node.js without XHR+Blob, this uses just Buffer polyfill. And Buffer polyfill is slow and buggy.
Same for the JS codepath here

See tables for more info:

1. https://docs.google.com/spreadsheets/d/1pdEefRG6r9fZy61WHGz0TKSt8cO4ISWqlpBN5KntIvQ/edit
2. https://docs.google.com/spreadsheets/d/1GnQYzrzEdF3Ea1hJUoEkEZEVNUI3ve8PKPFhLWcEoBI/edit