s4_ldrop(argument, …)

Removes leading empty arguments from the argument list:

⇐ {s4_ldrop(,,[Argument],[Another argument])}
⇒ {Argument,Another argument}

Inner and trailing empty arguments remain intact:

⇐ {s4_ldrop([Argument],,[Another argument],,)}
⇒ {Argument,,Another argument,,}

Returns list of quoted arguments:

⇐ {s4_ldrop([m4_toupper([String])],[m4_tolower([String])])}
⇒ {m4_toupper([String]),m4_tolower([String])}

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