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Differences with python version
===============================
## 1. Option object instead of keyword arguments
Python:
```py
# python allows keyword arguments
parser = argparse.ArgumentParser(prog='PROG', usage='%(prog)s [options]')
```
Javascript:
```js
// keyword arguments are passed as a single `options` object
parser = argparse.ArgumentParser({ prog: 'PROG', usage: '%(prog)s [options]' })
```
## 2. Use strings 'int', 'float' or 'str' instead of built-in python types
Python:
```py
parser.add_argument('--foo', type=int)
```
Javascript:
```js
parser.add_argument('--foo', { type: 'int' })
```
## 3. TypeError instead of ValueError
Python raises TypeError or ValueError for various argument errors. Javascript raises TypeError in both cases.
## 4. FileType() returns a stream
You should be closing it with `.close()` if available (which doesn't exist for stdin/stdout).
## 5. When class is called as a function, `.call` is executed
Override `Action.call` instead of `Action.__call__` in inherited classes
## 6. Limited support for %-formats
- `%s` is rendered as `String(arg)`
- `%r` is rendered as `util.inspect(arg)`
- `%d`, `%i` is rendered as `arg.toFixed(0)`, no precision digits or padding is supported
- no other formats are implemented yet
## 7. No `gettext` support
All error messages are hardcoded.
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