Should type be required for schemas and schema properties?

[amygdalama]

We noticed that some developers forgot to declare types in our schemas, and as a result validating responses against those schemas doesn't behave as strictly as we would like.

Here's an example:

>>> from flex.core import validate
>>> schema
{'additionalProperties': False, 'properties': {'name': {'type': 'string'}}}
>>> data = 0    
>>> validate(schema, data)

I forgot to add type: object here for the schema. Now, any data of any type can pass validation against this schema.

I'm not sure if this is a bug or not. I'd prefer flex to raise an error here, since it can't know how to validate data without a type. But maybe OAS allows undeclared types? I tried looking through the specification and didn't come up with anything. What do you think?

Here's a picture of cute anteaters.