function find( id ) { // eslint-disable-line stdlib/no-redeclare
	var node = cache.first();
	while ( node ) {
		if ( node.value.id === id ) {
			return node;
		}
		node = node.next;
	}
	return null;
}
Returns an array index object associated with a specified identifier.

@private
@param {*} id - identifier
@returns {(Node|null)} array index object