[_nalply]

Another example of sub-bit information:

Base85! 85 different ASCII characters have lb(85) ≈ 6.4094 bit. With 5 of then you get slightly more than 32 bits. Each of the 5 characters have a surplus 0.4 bit of information to add up to 2 bits.

To encode to Base85 use a 32 bit entity as an 32 bit unsigned integer then divide by 85 five times and take the remainders (from 0 to 84) as indices to the string of all Base85 characters of length 85.

To decode view the characters as a number written in base 85. This means that there are a few Base85 representations which are more than 2^31 - 1, this would mean an decoding error.