python: issues when implementing an interface

[eladb]

This example:

from aws_cdk.core import Stack, Construct, IAspect, IConstruct
import jsii

@jsii.implements(IAspect)
class MonitoringAspect:
    def visit(self, node: IConstruct) -> None:
        print("visit %s" % node)

class MyStack(Stack):
    def __init__(self, scope: Construct, cid: str, **kwarg) -> None:
        super().__init__(scope, cid, **kwarg)

        self.node.apply_aspect(MonitoringAspect()) # <-- WARNING: Expected type IAspect got MonitoringStack

__all__ = ["MyStack"]

Has the following issues:

1. Warning that says that apply_aspect expects IAspect and got MonitoringStack.
2. When visit is called, node is an ObjRef object instead of an IConstruct.

This is the output:

visit ObjRef(ref='@aws-cdk/core.Stack@10001')
visit ObjRef(ref='@aws-cdk/aws-dynamodb.Table@10004')
visit ObjRef(ref='@aws-cdk/aws-dynamodb.CfnTable@10019')
visit ObjRef(ref='@aws-cdk/core.Resource@10020')
visit ObjRef(ref='@aws-cdk/aws-lambda.Function@10008')
visit ObjRef(ref='@aws-cdk/aws-iam.Role@10021')
visit ObjRef(ref='@aws-cdk/aws-iam.CfnRole@10022')
visit ObjRef(ref='@aws-cdk/aws-iam.Policy@10023')
visit ObjRef(ref='@aws-cdk/aws-iam.CfnPolicy@10024')
visit ObjRef(ref='@aws-cdk/aws-lambda.CfnFunction@10025')
visit ObjRef(ref='@aws-cdk/aws-s3-assets.Asset@10026')
visit ObjRef(ref='@aws-cdk/assets.Staging@10027')
visit ObjRef(ref='@aws-cdk/core.CfnParameter@10028')
visit ObjRef(ref='@aws-cdk/core.CfnParameter@10029')
visit ObjRef(ref='@aws-cdk/core.CfnParameter@10030')
visit ObjRef(ref='@aws-cdk/core.Resource@10031')
visit ObjRef(ref='@aws-cdk/aws-lambda.CfnPermission@10032')
visit ObjRef(ref='@aws-cdk/aws-lambda.CfnPermission@10033')

Looks like the objref is not deserialized in the callback.

[eladb]

Another example of a jsii-generated class that implements an interface but fails type check:

aws_route53.ARecord(
    self, 'UrlShortenerDomain',
    record_name='go',
    zone=hosted_zone,
    target=aws_route53.RecordTarget.from_alias(aws_route53_targets.ApiGateway(api)))

Error is: expected type IAliasRecordType, got ApiGateway instead.