[dart-dio][client] Unusable Enums Produced

Description

When generating a dart-dio client, unusable Enums are created.

ImageResolutionEnum resolution = ImageResolutionEnum.number196

The only property of the enum is name which is just a string of the enum name. You'd expect that the value of ImageResolutionEnum.number196 to equal 196, but it instead equals the string 'number196'.

openapi-generator version

2.5.2 via npm install.

OpenAPI declaration file content or url

I can't really share the openapi spec, as it's for my employer and the API hasn't been made public yet.

Command line used for generation

openapi-generator-cli generate -g dart-dio -i $SPEC_FILE -c "conf/dart_client.yaml" -o $path --enable-post-process-file

Steps to reproduce

Generate a client against an OpenApi spec which contains an IntEnum.

Related issues/PRs

Several related, but not quite similar issues have occurred in the past, regarding issues with enums in the dart-dio client generation.

Suggest a fix/enhancement

Enums should return the expected value, not the name of the enum.

Start by reproducing the issue with the documented dart-dio generation command and an OpenAPI schema containing an IntEnum. Inspect the generated Dart enum and the dart-dio generator's enum handling to determine why the numeric value becomes a name string. Done means generated enum members expose their declared values, with coverage for this case if the generator has a relevant test location.