psql \df and opaque functions

is it a known issue that \df in psql does not list functions that return
opaque (i.e., those used in triggers)?

also, does \dd only list builtins?  if so, is there a convenient way to
view triggers in psql?

-tfo

p.s. i've looked through the docs, to no avail, and would've checked
the archives, but search seems to be broken, at the moment.