additionalProperties can be a bool or schema about openapi-core

[dremdem]

additionalProperties:
  type: number

This statement is not supported also.

[berend]

I ran into this as well. I would consider this not as enhancement, but as bug, because you can not load valid openapi files. Maybe a step into fixing this is to ignore it.

Simple way to reproduce:

openapi: 3.0.0
info: 
  version: "1"
  title: openapi test
paths:
  /foo:
    post:
      tags:
        - foo
      summary: foo
      requestBody:
        required: true
        content:
            application/json:
              schema:
                type: object
                additionalProperties: true
                example:
                  foo: bar
                  bar: foo
      responses:
        "200":
          description: Ok
          content:
            application/json:
              schema:
                type: string

from openapi_core import create_spec
from openapi_core.shortcuts import RequestValidator 
import yaml

with open("openapi.yaml") as f:
    openapi_spec = yaml.safe_load(f)

spec = create_spec(openapi_spec)
validator = RequestValidator(spec)