[jandrese]

I actually wonder if the combinatoral explosion of attempting to enumerate every possible character combination would exceed 2^64 bits. My intuition is that it might, and also such a system would be unworkably unwieldy. The size of the spec document would also suffer from the combinatoral explosion. Imagine a system that tries to encode a unique entry for every possible Zalgo character.

Also, literally nobody wants to use 64 bit values to encode ASCII values. Even in our world of insanely large storage that would be breathtakingly wasteful.