I want to use variable that refer to snake case for enum in mustash file.

Is your feature request related to a problem? Please describe.

I want to create Enum class of python.

In openapi-generator:v5.4.0 , the name including hyphen is not converted to snake case.

petstore.yaml

openapi: "3.0.0"
info:
  version: 1.0.0
  title: Swagger Petstore
  license:
    name: MIT
servers:
  - url: http://petstore.swagger.io/v1
paths:
  /lang:
    get:
      summary: getLang
      operationId: getLang
      responses:
        '200':
          description: foo
          content:
            application/json:    
              schema:
                $ref: "#/components/schemas/Lang"
components:
  schemas:
    Lang:
      type: string
      enum:
        - ja-JP
        - en-US

template/models.mustache

from enum import Enum
{{#models}}
{{#model}}
{{#isEnum}}
class {{classname}}(Enum):
{{#allowableValues}}
{{#enumVars}}
    {{name}} = {{{value}}}
{{/enumVars}}
{{/allowableValues}}
{{/isEnum}}
{{/model}}
{{/models}}

command

$ docker run --rm -u `id -u`:`id -g` -v ${PWD}:/local openapitools/openapi-generator-cli:v5.4.0 generate \
 --input-spec /local/petstore.yaml --generator-name python --output /local/out \
 --template-dir /local/template --global-property models,modelTests=false,modelDocs=false

out/openapi_client/model/lang.py

from enum import Enum
class Lang(Enum):
    JA-JP = "ja-JP"
    EN-US = "en-US"

Describe the solution you'd like

I want to use variable that refer to snake case in mustash file.

Additional context

In openapi-generator:v4.3.1 , the name included hyphen is converted to snake case.
Why did the behaivior change?

Start with petstore.yaml, template/models.mustache, and the generated out/openapi_client/model/lang.py, then reproduce the result using the documented v5.4.0 Docker command. Compare the enum variable names with the v4.3.1 behavior described in the issue; done means the custom template can reference snake-case names for hyphenated enum values without producing invalid Python identifiers.