Update of bug #67285 (group groff):

                Category:        Preprocessor eqn => Preprocessor -
others/general
                  Status:                   Fixed => In Progress
             Open/Closed:                  Closed => Open
                 Summary: [eqn] mangles multibyte UTF-8  sequences (or other
bytes with eighth bit set)  it should pass through =>
[grn,eqn,pic,refer,soelim,tbl] should pass through, not mangle, multibyte
UTF-8  sequences

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Follow-up Comment #3:

Reopening and generalizing, because several other preprocessors have this
problem too.

This is all of them except _pre-grohtml_ and _preconv_.

I think we can exclude those; the former is just a way to run "troff -Tps" so
the usual GNU _troff_ rules about 8-bit input apply to it.

And we can exclude the latter because the whole point of _preconv_ is to bust
the input down to US-ASCII so that GNU _troff_ can eat it without distress.


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