import { hexToBin } from "https://deno.land/x/libauth@v2.0.0-alpha.9/src/lib/format/hex.ts";
Decode a hexadecimal-encoded string into a Uint8Array.
E.g.: hexToBin('2a64ff') → new Uint8Array([42, 100, 255])
Note, this method always completes. If validHex is not divisible by 2,
the final byte will be parsed as if it were prepended with a 0 (e.g. aaa
is interpreted as aa0a). If validHex is potentially malformed, check
it with isHex before calling this method.