can-map.js
function (attr) {
			if (attr !== undefined) {
				var computedAttr = this._computedAttrs[attr];
				if (computedAttr) {
					// return computedAttr.compute();
					return canReflect.getValue(computedAttr.compute);
				} else {
					return hasOwnProperty.call(this._data, attr) ? this._data[attr] : undefined;
				}
			} else {
				return this._data;
			}
		}
function (attr) {
			if (attr !== undefined) {
				var computedAttr = this._computedAttrs[attr];
				if (computedAttr) {
					// return computedAttr.compute();
					return canReflect.getValue(computedAttr.compute);
				} else {
					return hasOwnProperty.call(this._data, attr) ? this._data[attr] : undefined;
				}
			} else {
				return this._data;
			}
		}
### ___get When called with an argument, returns the value of this property. If that property is represented by a computed attribute, return the value of that compute. If no argument is provided, return the raw data.