* Return the data item bound to the first element in the selection.

* Returns an array of key-value objects in arbitrary order.

* Wrapper for linking function which converts normal linking function into a grouped * linking function. * @param linkFn * @param attrS

* Given a node with an directive-start it collects all of the siblings until it finds * directive-end. * @param node * @param attrStart

* Returns a function that provides access to parsed headers. * * Headers are lazy parsed when first requested. * @see parseHeaders * * @param {(s

* Determine if a value is an object with a null prototype * * @returns {boolean} True if `value` is an `Object` with a null prototype