v1.103.1 -> v1.104.0 upgrade breaks Python code using an IntEnum value where int is expected

[anentropic]

Describe the bug

I have Python CDK code like this:

from enum import IntEnum
from aws_cdk import aws_ecs as ecs

class FargateCpu(IntEnum):
    QUARTER = 256  # 0.25 vCPU
    HALF = 512
    ONE = 1024
    TWO = 2048
    FOUR = 4096
    EIGHT = 8192
    SIXTEEN = 16384

task = ecs.FargateTaskDefinition(
    self,
    "<Task Name>",
    cpu=FargateCpu.ONE,
    ...
)

After upgrading dependency packages:

Update jsii 1.103.1 -> 1.104.0 successful

...the code above has started breaking with AttributeError: __jsii_type__

if I amend this line: cpu=FargateCpu.ONE.value then it works again

but that should not be necessary

Regression Issue

• Select this option if this issue appears to be a regression.

Expected Behavior

IntEnum is a true subclass of int

so this is not just a duck-typing problem but a failure to recognise subtype

it should be valid to use IntEnum member anywhere that int is expected

Current Behavior

infra/constructs/containers.py:154: in __init__
    self.tasks[task_name] = task = ecs.FargateTaskDefinition(
.venv/lib/python3.11/site-packages/jsii/_runtime.py:118: in __call__
    inst = super(JSIIMeta, cast(JSIIMeta, cls)).__call__(*args, **kwargs)
.venv/lib/python3.11/site-packages/aws_cdk/aws_ecs/__init__.py:41433: in __init__
    jsii.create(self.__class__, self, [scope, id, props])
.venv/lib/python3.11/site-packages/jsii/_kernel/__init__.py:334: in create
    response = self.provider.create(
.venv/lib/python3.11/site-packages/jsii/_kernel/providers/process.py:365: in create
    return self._process.send(request, CreateResponse)
.venv/lib/python3.11/site-packages/jsii/_kernel/providers/process.py:323: in send
    req_dict = self._serializer.unstructure(request)
.venv/lib/python3.11/site-packages/cattrs/converters.py:300: in unstructure
    return self._unstructure_func.dispatch(
.venv/lib/python3.11/site-packages/jsii/_kernel/providers/process.py:107: in unstructurer
    unstructured = asdict(value)
.venv/lib/python3.11/site-packages/cattrs/converters.py:588: in unstructure_attrs_asdict
    rv[name] = dispatch(a.type or v.__class__)(v)
.venv/lib/python3.11/site-packages/cattrs/gen/__init__.py:1048: in unstructure_iterable
    return _seq_cl(_hook(i) for i in iterable)
.venv/lib/python3.11/site-packages/cattrs/gen/__init__.py:1048: in <genexpr>
    return _seq_cl(_hook(i) for i in iterable)
.venv/lib/python3.11/site-packages/cattrs/converters.py:300: in unstructure
    return self._unstructure_func.dispatch(
:2: in unstructure_mapping
    ???
:2: in <genexpr>
    ???
.venv/lib/python3.11/site-packages/cattrs/converters.py:300: in unstructure
    return self._unstructure_func.dispatch(
:2: in unstructure_mapping
    ???
:2: in <genexpr>
    ???
.venv/lib/python3.11/site-packages/cattrs/converters.py:300: in unstructure
    return self._unstructure_func.dispatch(
:2: in unstructure_mapping
    ???
:2: in <genexpr>
    ???
.venv/lib/python3.11/site-packages/cattrs/converters.py:300: in unstructure
    return self._unstructure_func.dispatch(
.venv/lib/python3.11/site-packages/jsii/_kernel/providers/process.py:126: in _unstructure_enum
    return {"$jsii.enum": f"{member.__class__.__jsii_type__}/{member.value}"}
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 

cls = <enum 'FargateCpu'>, name = '__jsii_type__'

    def __getattr__(cls, name):
        """
        Return the enum member matching `name`
    
        We use __getattr__ instead of descriptors or inserting into the enum
        class' __dict__ in order to support `name` and `value` being both
        properties for enum members (which live in the class' __dict__) and
        enum members themselves.
        """
        if _is_dunder(name):
>           raise AttributeError(name)
E           AttributeError: __jsii_type__

Reproduction Steps

see above

Possible Solution

No response

Additional Information/Context

I have guessed this is a JSII issue rather than something in CDK lib.

SDK version used

1.104.0

Environment details (OS name and version, etc.)

macos 14.6.1, nodejs v20.15.1, Python 3.11

[otaviomacedo]

Hi, @anentropic. Can you provide more details on how to reproduce this issue? I have created a simple Python CDK app with the code above and it works as expected.

[github-actions]

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