Exotic Silicon is making the mistake that we all have made, of getting ITU T.416 wrong.
I hope that no-one merges that code, because it would be baking erroneous control sequences into #OpenBSD.
Most of the rest of we terminal emulator authors have been though the process, and by now have switched to the correct control sequence that T.416 actually specifies.
It requires colons for sub-parameters, and there is a colour space sub-parameter.