Uint32          T_UV

Timeline *      O_OBJECT
Tween *         O_OBJECT
Seeker *        O_OBJECT

OUTPUT
O_OBJECT
    sv_setref_pv( $arg, CLASS, (void*)$var );

INPUT
O_OBJECT
    if( sv_isobject($arg) && (SvTYPE(SvRV($arg)) == SVt_PVMG) )
        $var = ($type)SvIV((SV*)SvRV( $arg ));
    else{
        warn( \"${Package}::$func_name() -- $var is not a blessed SV reference\" );
        XSRETURN_UNDEF;
    }