Incorrect types cast

[EternalStuden1]

Hi everyone.

I've had an experience with openapi module and it's perfect, good job!
But there is an issue that makes using openapi more complex - incorrect types casting when model field value is empty.
E.g. for any field with NUMBER type GET request will return false instead of null.
To fix that I propose to replase this code with the following:

result[field] = None if not value.id else value.id

In this case it will be possible to deserialize field value to corrent type.