Different argument counts in function calls are returning tue

Using the following code (in node):

```
var Structured = require('structured');
var structure = function() {
$fn($a, $b);
};
var code = "fn('a', 'b', 'c');";
console.log(Structured.match(code, structure));
```

I get `true` when I'm expecting `false`.

If you change the argument counts around:

```
var Structured = require('structured');
var structure = function() {
$fn($a, $b, $c);
};
var code = "fn('a', 'b');";
console.log(Structured.match(code, structure));
```

`false` is returned as expected.

Reproduce both examples in Node.js and start at Structured.match, the entry point named in the report, tracing how argument counts are compared. Done means the first example returns false while the second continues to return false; verify both results with the project's existing checks if available.

Written by the indexing model from the issue text.