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( args-fold ( list? args ) ( list? options ) ( procedure? unrecognized-option-proc ) ( procedure? operand-proc ) seed ... ) ( values * ... )
Typing of parameters and result
( unrecognized-option-proc ( option option ) ( string? / char? name ) ( string? arg ) seed ... ) ( values * ... )
( operand-proc ( string? operand ) seed ... ) ( values * ... )