store / EvalIO: support more than just strings

Opened by flokli at 2023-05-11T14·54+00

Some paths (japanese font filenames for example) are invalid UTF-8.

Update the structures/interfaces to allow passing arbitrary bytes as filenames etc.
Update the castore proto defs to allow arbitrary bytes (other than some few disallowed ones, like "/", make sure the validate functions still work properly

See also b/189

tazjin at 2023-05-11T15·38+00
This should be done with cl/8975, cl/8978 and cl/8974.

cl/8990 also adds support to have non-unicode strings in derivations.

flokli at 2023-07-29T21·51+00
flokli closed this issue at 2023-07-29T21·51+00