> >> So, I believe the rule should be either:
> >>
> >> - All clients are able to consume data in UTF-8. Period. All Delphi
> >> users will cry when they start to convert Unicode strings to SBCS
> >> and back.
> >
> > FBClient is not required to break external API
>
> You can't. The logic of something-to-NONE conversion is that "read"

That was not the question of something to none.
It was generic topic.

And i mean that even is wire protocol would be Unicode-only, that does not necessary mean client cannot provide non-Unicode API.

Making wire protocol Unicode-only would require new version of fbclient, but not render application no more working.