[tex-hyphen] hyphenation with ligatures in input

[Philip Taylor]

Hans Hagen wrote:

> input shouldn't contain such ligatures and if it does, it might be with a purpose

I cannot agree with the first part of that statement, although I do with
the second.  In a Unicode world (into which we are emerging,
from a very long period in the Dark Ages), any character that is
in the Unicode character set must be valid in an input document.
It may well be that TeX-based engines that use Unicode will have
to evolve further to handle the complexities that will undoubtedly
arise.

Philip Taylor