Non unique enum names with `-` and `+` prefixes

What are the steps to reproduce this issue?

1. Add an enumeration with two values that vary only with the - and + prefixes:

        - in: query
          name: sort
          required: false
          description: >
            The property to sort on. Direction is ascending by default. To 
            indicate descending, prefix property with `-`
          schema:
            type: string
            enum:
              - date
              - -date

What happens?

Those special characters are ignored and the keys are identical:

  export const MyOperationSort = {
    date: '-date' as MyOperationSort,
    date: 'date' as MyOperationSort,
  };

What were you expecting to happen?

The special characters are escaped so that we can use the enumeration.

Any other comments?

This issue has been discovered while using the - and + convention to define the direction on a sorting parameter. It has been reported on the guideline owner too: https://github.com/belgif/rest-guide/issues/98

[anymaniax]

Hello @NimmLor, just added x-enumNames with the orval@6.11.0-alpha.4

[anymaniax]

For the next release, I would like to give a flag to remove the parsing completely and also the possibility to parse it how you want