`-` in enum results in duplicate

I have an enum that has all the filtering options

By salePrice
By Reverse salePrice

The values are salePrice and -salePrice. It's is quite common that a dash is used to denote a reverse ordering. The problem is that swagger_parser strips out the - Using this did not help:

replacement_rules:
    # Example of rule
    - pattern: "-"
      replacement: "reverse"

This is the generated enum

@JsonEnum()
enum O2 {

  @JsonValue('-salePrice')
  salePrice('-salePrice'), // <--Duplicate

  @JsonValue('salePrice')
  salePrice('salePrice'), // <--Duplicate

  /// Default value for all unparsed values, allows backward compatibility when adding new values on the backend.
  $unknown(null);

  const O2(this.json);

  factory O2.fromJson(String json) => values.firstWhere(
        (e) => e.json == json,
        orElse: () => $unknown,
      );

  final String? json;
}

Carapacik / swagger_parser

`-` in enum results in duplicate #163