index.js
function(key) {
    var attr = this.__attrs[key];

    if (!attr) {
      return;
    }

    var value = attr.value = attr._origin;
    var setup = attr.type.setup;

    if (setup) {
      setup.call(this.host, value, key, this);
    }
  }
function(key) {
    var attr = this.__attrs[key];

    if (!attr) {
      return;
    }

    var value = attr.value = attr._origin;
    var setup = attr.type.setup;

    if (setup) {
      setup.call(this.host, value, key, this);
    }
  }
function ( key ) { var attr = this . __attrs [ key ] ; if ( ! attr ) { return ; } var value = attr . value = attr . _origin ; var setup = attr . type . setup ; if ( setup ) { setup . call ( this . host , value , key , this ) ; } }
Force to unsetting a value by key, use this method carefully.
Force to unsetting a value by key use this method carefully .