The file extension for a runez2 archive is
The archive is little-endian binary encoded in the form:
[rune int32] … [\0 rune] [N uint8] …
Each rune is a valid utf-8 character, stored by Go as an int32(?).
\0 is a null rune separating the preamble from the set of indices.
Each uint8 index
N is referring to an index position
N within the ordered table of runes at the beginning of the archive.
The general conversion looks like:
α β ξ \0 0 1 2 0 1 2