code: function _use_zcache_p(yes_no){
  	if( yes_no == true ){
  	    use_zcache_p = true;
  	}else if( yes_no == false ){
  	    use_zcache_p = false;
  	}
  	return use_zcache_p;
      }
docs: Play with whether to use the cache or not.