mixilchenko opened a new issue, #51016:
URL: https://github.com/apache/airflow/issues/51016
### Apache Airflow version
main (development)
### If "Other Airflow 2 version" selected, which one?
_No response_
### What happened?
When enumeration inherits some primitive type (e.g. str, int),
deserialization makes the value primitive as well.
```python
import enum
from airflow.serialization.serde import deserialize, serialize
class MyEnum(enum.IntEnum):
A = 1
B = 2
value = MyEnum.A
res = deserialize(serialize(value))
assert res is MyEnum.A, f'{type(res)=}, {res=}'
# AssertionError: type(res)=<class 'int'>, res=1
```
### What you think should happen instead?
This is little unexpected for me as a user and for mypy
```python
@task
def my_task(v: MyEnum):
assert is instance(v, MyEnum), 'fine for mypy, fails in runtime'
v = MyEnum(v)
...
my_task(MyEnum.A)
```
The other issue is that if I add airflow compatible custom serialization the
result is incorrect too
```python
class MyEnum(enum.IntEnum):
A = 1
B = 2
def serialize(self):
return f'{self.name}.{self.value}'
res = serialize(MyEnum.A)
assert res == 'A.1', f'{type(res)=}, {res=}'
# AssertionError: type(res)=<class 'int'>, res=1
```
I would expect one of
- implement default serialization and deserialization for enums
- fail with `TypeError: cannot serialize object of type <enumeration
'MyEnum'>` unless it implements the interface and is registered for
deserialization (as it happens for enums that do not inherit primitive)
### How to reproduce
See the snippet above
### Operating System
Debian GNU/Linux 12 (bookworm)
### Versions of Apache Airflow Providers
_No response_
### Deployment
Virtualenv installation
### Deployment details
_No response_
### Anything else?
_No response_
### Are you willing to submit PR?
- [x] Yes I am willing to submit a PR!
### Code of Conduct
- [x] I agree to follow this project's [Code of
Conduct](https://github.com/apache/airflow/blob/main/CODE_OF_CONDUCT.md)
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