A UTF-58 encoder and decoder. UTF-58 (pronounced fifty-eight) is an encoding for arbitrary Unicode codepoints that uses an initial 5 bits (called a quibble), and then up to 3 bytes.
This is useful when wanting to encode a Unicode codepoint in a way that leaves 3 bits of space for additional data.
UTF-58 is kinda ASCII-compatible (as in, the first quibble represents the truncated ASCII value) for lowercase a-z.
For more information, check the official specification.