peer.ID does not work as map key in JSON maps

[hsanjuan]

Since peer.IDs defines themselves as str, defining a map[peer.ID]<type> and marshaling that to JSON does not make use of the MarshalText() facility to encode the map keys. Somehow default encoding/decoding when doing it doesn't work (it decodes peers with different IDs but doesn't complain, which is worse).

See golang/go#28827

Probably doing the same thing as cids and switching to type ID struct { str string } would fix this.

However, this might be very breaking because people rely on doing pid1 == pid2 (and I think that would stop working, at least from outside this package? it is not clear from the Go documentation).

Thoughts?

[vyzo]

Let's not change that, the pid1 == pid2 test is prevalent in the codebase.

[Stebalien]

pid1 == pid2 would still work with type ID struct { str string }. The only issue would be pid1 == "" (which we do use) but I can live with that.