[BUG][KOTLIN] Number-based enums with defaults result in invalid Kotlin enums

[acsbendi]

Bug Report Checklist

• Have you provided a full/minimal spec to reproduce the issue?
• 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?
• [Optional] Sponsorship to speed up the bug fix or feature request (example)

Description

Number-based enums with defaults result in invalid Kotlin enums. With no options, enums are generated like this:

 enum class OwnedByYouGetArchivedDeals(val value: java.math.BigDecimal) {
        @JsonProperty(value = ""0"") _0("0"),
        @JsonProperty(value = ""1"") _1("1")
    }

After adding number=kotlin.Int as a type mapping, the resulting enum is fine, but the instantiations of non-null default values are still broken:

enum class IsActive(val value: kotlin.Int) {
        @JsonProperty(value = "0") _0(0),
        @JsonProperty(value = "1") _1(1);
    }

val isActive: BaseWebhook.IsActive? = kotlin.Int("IsActive._1"),

openapi-generator version

I use the latest version of the Maven plugin (openapi-generator-maven-plugin, version 7.20.0).

OpenAPI declaration file content or url

Number-based boolean enums, with a default value:

                - in: query
                  name: skip_users
                  schema:
                      title: numberBooleanDefault0
                      type: number
                      default: 0
                      enum:
                          - 0
                          - 1
                  description: 'When enabled, the teams will not include IDs of member users'

Generation Details

mvn generate-sources

Steps to reproduce

Generate Kotlin sources based on the OpenAPI specification shown above.

Related issues/PRs

I couldn't find any.

Suggest a fix

The type constructor shouldn't be used for enums.