s4_rdrop(argument, …)

Removes trailing empty arguments from the argument list:

⇐ {s4_rdrop([Argument],[Another argument],,)}

⇒ {Argument, Another argument}

Leading and inner empty arguments remain intact:

⇐ {s4_rdrop(,,[Argument],,[Another argument])}

⇒ {, , Argument, , Another argument}

Returns list of quoted arguments:

⇐ {s4_rdrop([m4_toupper([String])],[m4_tolower([String])])}

⇒ {m4_toupper([String]), m4_tolower([String])}

(Note: m4_toupper and m4_tolower macros are not expanded.)