**Describe the bug** See title. **To Reproduce** Generate a client from this Swagger: https://converter.swagger.io/api/convert?url=https://integration-www.tangocard.com/raas_api_console/v2/api-docs/swagger.json The package names will start with a number and be un-importable. **Expected behavior** Number is dropped. **OpenAPI Spec File** https://converter.swagger.io/api/convert?url=https://integration-www.tangocard.com/raas_api_console/v2/api-docs/swagger.json