Drawback of using 'return' is that, if the user has Identifier warning checked, it causes for every line an error "* No such identifier: $return". This does not happen with '$' as filter target.
Fair enough. I incorrectly assumed that /filter would call the alias as a regular alias as opposed to what it apparently does which is to call the alias as an identifier.
I actually think this behavior is strange because /filter is not interpreting any returned value from the called alias.
