FieldNameForChild returns false results

[vjerci]

When selecting ruby language and when doing this query

log.info($ARGUMENTS)

If we take the tree we will get this tree:

[program](https://tree-sitter.github.io/tree-sitter/playground#) [0, 0] - [1, 0]
  [call](https://tree-sitter.github.io/tree-sitter/playground#) [0, 0] - [0, 20]
    receiver: [identifier](https://tree-sitter.github.io/tree-sitter/playground#) [0, 0] - [0, 3]
    method: [identifier](https://tree-sitter.github.io/tree-sitter/playground#) [0, 4] - [0, 8]
    arguments: [argument_list](https://tree-sitter.github.io/tree-sitter/playground#) [0, 8] - [0, 20]
      [global_variable](https://tree-sitter.github.io/tree-sitter/playground#) [0, 9] - [0, 19]

As we can see there are 3 field names receiver, method and arguments

Now iterating or namedChildCount of call node with following code

for j := 0; j < int(node.NamedChildCount()); j++ {
	log.Println("it is "+ strconv.Itoa(j), node.FieldNameForChild(j))
}

we get results

it is 0 method
it is 1 arguments
it is 2

As we can see order is messed up (method should be on index 1, on index 0 it should be receiver)
field name receiver is also missing.

[lcaballero]

I've noticed similar behavior when traversing the tree through the Node interface vs using the TreeCursor. The TreeCursor seems to find the correct Field and the Node.FieldNameForChild doesn't.