ASGI

Sometimes it might be handy to easily get a header's value as int, where validation errors would automatically result in an HTTP 400, along the lines of req.get_header_as_datetime & [req.get_param_as_int](https://falcon.readthedocs.io/en/stable/api/request_and_response_wsgi.ht

We only have documentation for schema directives, we should document query directives, here's an example of how they work: https://github.com/strawberry-graphql/strawberry/blob/main/tests/schema/test_directives.py

Should add a section to the docs for third-party examples and guides using Mangum

It would be nice if there was a new clause which can be added to queries called callback.

For example:

def callback_handler(success, value):
    if success:
        print(f'The query was successful and returned {value}')
    else:
        print("The query failed")

Band.select().callback(callback_handler).run_sync()

The callback could be a function or coroutine, wh

Starlette's ASGI types use MutableMapping[str, Any] which is not too different from just typing them dict. This package is fully spec compliant and would help in implementing additional ASGI functionality, as it would allow us to see exactly which keys are available/required to support a feature. There is currently a PR for Starlette that addres

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