invalid parameter type for enum

[hauner]

openapi: 3.0.0
info:
  title: sample API
  version: 1.0.0

paths:
  /foo:
    get:
      parameters:
        - name: foo-foo
          description: test parameter
          in: query
          required: false
          schema:
            type: string
            enum:
              - foo-1
        - $ref: '#/components/parameters/Bar'
      responses:
        '204':
          description: response


components:
  parameters:

    Bar:
      name: bar-bar
      description: test parameter
      in: query
      required: false
      schema:
        type: string
        enum:
          - bar-1
          - bar-2

generates

package io.openapiprocessor.oap.api;

import io.openapiprocessor.oap.model.Bar-bar;
import io.openapiprocessor.oap.model.Foo-foo;
import io.openapiprocessor.oap.support.Generated;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestParam;

@Generated(value = "openapi-processor-spring", version = "2023.3-SNAPSHOT")
public interface Api {

    @GetMapping(path = "/foo")
    void getFoo(
            @RequestParam(name = "foo-foo", required = false) Foo-foo fooFoo,
            @RequestParam(name = "bar-bar", required = false) Bar-bar barBar);

}