Implications of multi-byte support in a distribution

I have had a request to add multi-byte support to the Debian binary
packages of PostgreSQL.

Since I live in England, I have personally no need of this and therefore
have little understanding of the implications.

If I change the packages to use multi-byte support, (UNICODE (UTF-8) is
suggested as the default), will there be any detrimental effects on the
fairly large parts of the world that don't need it?  Should I try to
provide two different packages, one with and one without MB support?

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