typescript openapi 3 boolean response result as string

Description

API return boolean result as a string in the generated code. in the generated code in runtime.ts there is no implementation of ApiResponse for boolean.
so the generated code for the API looks like that:

export class fooApi extends runtime.BaseAPI {

    async fooRaw(requestParameters: fooRequest): Promise<runtime.ApiResponse<boolean>> {
        const queryParameters: runtime.HTTPQuery = {};
        const headerParameters: runtime.HTTPHeaders = {};

        const response = await this.request({
            path: `/foo`,
            method: 'GET',
            headers: headerParameters,
            query: queryParameters,
        });

		// this is the problem
        return new runtime.TextApiResponse(response) as any;
    }

    /**
     */
    async foo(): Promise<boolean> {
        const response = await this.fooRaw();
        return await response.value();
    }
}

Swagger-codegen version

openapi-generator-cli-4.2.3

Start with the generated TypeScript runtime.ts and the fooApi response path shown in the issue, then inspect how boolean ApiResponse values are handled. Reproduce the OpenAPI 3 boolean response and verify that the generated foo() method returns a boolean rather than a string; the payload names no test file.