CIText and pattern_ops

Is there any particular reason why the citext module doesn't have
citext_pattern_ops operator family?

Specifically, I wish to index for this type of query:

... WHERE citext_column LIKE 'Foo%';

This, of course, is equivalent to ILIKE 'Foo%' which does not appear
to be indexable without using a functional index (
lower(citext_column) ).