Type null string

- Type null string avro
- Type string null is not assignable
- Json type string null
- Unknown type string null
- Typescript type string null
- Avro schema type null string
- Openapi type string null
- Argument of type 'string null' is not assignable
- Argument of type string null
- Type 'null' is not a subtype of type 'bool'
- Type never typescript