[BUG] [kotlin-spring] EnumConverterConfiguration fails to generate converter methdod for enum types which start with numerical value

[natto-code]

Bug Report Checklist

• Have you validated the input using an OpenAPI validator?
• Have you tested with the latest master to confirm the issue still exists?
• Have you searched for related issues/PRs?
• What's the actual output vs expected output?
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Description

The issue occurs when the enum converter functions are generated for enum names that starts with digits. Identifiers cannot start with digits in Kotlin so the generator attempts to escape the name but this creates invalid syntax in the function declaration.

openapi-generator version

Introduced in 7.15.0
bfb6938

OpenAPI declaration file content or url

openapi: 3.1.0
info: 
  version: 1.0.0
  title: Test api
components:
  schemas: 
    123Example:
      type: string
      enum:
        - TESTING
        - TESTING_2
        - TESTING_3

Generates:

class EnumConverterConfiguration {
	@Bean(name=["org.openapitools.configuration.EnumConverterConfiguration`123Example`Converter"])
	fun &#x60;123Example&#x60;Converter(): Converter<Kotlin.String, Model123ExampleDto> {
		return object: Converter<kotlin.String, Model123ExampleDto> {
			override fun convert(source: kotling.String): Model123ExampleDto = Model123ExampleDto.forValue(source)
		}
	}
}

Suggest a fix

Prefix function name with Model if enum name starts with a number, similar to how the model classes are named

[Chrimle]

This isn't supported by the Java language, and it's a shame that a bandaid fix was applied to the class names. 😕 It would be easier to simply say that it's not supported, and the Model-prefix to be removed in the next major release... 🤔