ADR-002: InfoReservedByte

[rootulp]

Description

Moved from celestiaorg/celestia-core#843
ADR with implementation details for celestiaorg/celestia-core#839

[rootulp]

We had a meeting on info reserved byte and aligned on using it universally rather than just for message shares. See #659

Closing this PR but will use the contents of this ADR in a new one for the universal share encoding format.

[evan-forbes]

Closing this PR but will use the contents of this ADR in a new one for the universal share encoding format.

initially these seem like separate proposals/implementation efforts, but I can see how they might be blocking. Is that why they were merged in #660?

[rootulp]

I merged them because I had the wrong interpretation of the previous proposal. I thought the info byte was only applicable to message shares. Given info share byte applies to both types of shares, I renamed and updated the ADR. This PR (for info bye just on message shares) seems no longer necessary.

With regards to implementation: we can split PRs into smaller chunks (i.e. one for updating the message share format and a separate one for updating the reserved namespace share format). I don't think one is strictly blocking the other but I do think it would be easier to tackle this work post merging in-flight share refactor PRs.