Middleware breaks OpenAPI YAML

[arjunyel]

Works without the middleware field: "Error: Tag not resolved for AsyncFunction value"

import { bearerAuth } from 'hono/bearer-auth'
import { stringify } from "yaml"

describe("Generate YAML", () => {
  it("Should generate YAML with Middleware", async () => {
    const app = new OpenAPIHono()
    app.openapi(
      createRoute({
        method: 'get',
        path: '/books',
        middleware: [bearerAuth({
          verifyToken: (_, __) => {
            return true;
          },
        })],
        responses: {
          200: {
            description: 'Books',
            content: {
              'application/json': {
                schema: z.array(
                  z.object({
                    title: z.string(),
                  })
                ),
              },
            },
          },
        },
      }),
      (c) => c.json([{ title: 'foo' }])
    )
    const doc = app.getOpenAPI31Document({
      openapi: '3.1.0',
      info: {
        title: 'My API',
        version: '1.0.0',
      }
    });
    expect(() => stringify(doc)).to.not.throw();
  })
});