code: function isDoubleLogicalNegating(node) {
  		return node.operator === "!" &&
  			node.argument.type === "UnaryExpression" &&
  			node.argument.operator === "!";
  	}
docs: Checks whether or not a node is a double logical negating.
  @param {ASTNode} node - An UnaryExpression node to check.
  @returns {boolean} Whether or not the node is a double logical negating.