Is there a sense to add generic nodes to traversing, such as _Expression_, _Function_, _Node_, _Statement_, _Declaration_, _Pattern_? That is done in [ast-types](https://github.com/benjamn/ast-types#ast-traversal), and that feature seems to be quite useful. For example: ``` js visit(ast, { //walk into any node Node: function(node){ } }); ``` Just an idea.
