Generated code has duplicate constructors for different enum variants

[schoettl]

Hi there, thanks for this great code gen! I'd just like to hear some opinions how to best fix this issue:

In the Xentral ERP OpenAPI spec they use this inline declaration of a "Loose boolean type".

"/api/products": {
 "requestBody": {
   "content": {
     "schema": {
       "properties": {
                …
                  "allowPurchaseFromAllSuppliers": {
                    "description": "Loose boolean type which accepts boolean, number 0 or 1 and string 'true' or 'false'",
                    "example": "'true'",
                    "oneOf": [
                      {
                        "type": "boolean"
                      },
                      {
                        "type": "number",
                        "enum": [
                          0,
                          1
                        ]
                      },
                      {
                        "type": "string",
                        "enum": [
                          "true",
                          "false",
                          "True",
                          "False",
                          "TRUE",
                          "FALSE"
                        ]
                      }
                    ]
                  },

which translates to

data ExternalReference'createRequestBodyIsActive'OneOf3 =
   ExternalReference'createRequestBodyIsActive'OneOf3Other Data.Aeson.Types.Internal.Value -- ^ This case is used if the value encountered during decoding does not match any of the provided cases in the specification.
  | ExternalReference'createRequestBodyIsActive'OneOf3Typed Data.Text.Internal.Text -- ^ This constructor can be used to send values to the server which are not present in the specification yet.
  | ExternalReference'createRequestBodyIsActive'OneOf3EnumTrue -- ^ Represents the JSON value @"true"@
  | ExternalReference'createRequestBodyIsActive'OneOf3EnumFalse -- ^ Represents the JSON value @"false"@
  | ExternalReference'createRequestBodyIsActive'OneOf3EnumTrue -- ^ Represents the JSON value @"True"@
  | ExternalReference'createRequestBodyIsActive'OneOf3EnumFalse -- ^ Represents the JSON value @"False"@
  | ExternalReference'createRequestBodyIsActive'OneOf3EnumTRUE -- ^ Represents the JSON value @"TRUE"@
  | ExternalReference'createRequestBodyIsActive'OneOf3EnumFALSE -- ^ Represents the JSON value @"FALSE"@

where we have duplicate names in the type constructors.

I think it boils down to issue #85.

But in this case the enum is defined inline, not DRY in a scheme. So I'd need to patch dozens of generated files.

I didn't find an command line option to fix it.

As the request body is made by me and I will use Bool instead of some strings it should be save to delete the enum from the oneOf section. Maybe this can be done with jq. Or I just use sed but that might remove some occasions where it shouldn't.

Are there better ideas?