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Enum with exactly opposite negative and positive integer values results in duplicate enum entries #474

Description

@juliusBaranauskas

When schema contains enums with integer values, their member names are generated as Value${absoluteValueOfActualValue}, which causes Value${absoluteValueOfActualValue} == Value${actualValue}, so when enums have negative and positive values of the same absolute value, they are generated with identical names.

This swagger.json entry:

      "AddressFamily": {
        "enum": [
          0,
          1,
          2,
          3,
          4,
         <...>
          29,
          65536,
          65537,
          -1,
        ],
        "type": "integer",
        "format": "int32"
      },

results in this incorrect typescript enum, since Value1 is duplicate enum member name:

export enum AddressFamily {
    Value0 = 0,
    Value1 = 1,
    Value2 = 2,
    Value3 = 3,
    Value4 = 4,
    <...>
    Value29 = 29,
    Value65536 = 65536,
    Value65537 = 65537,
    Value1 = -1,
}

It broke after release of v12, as previously these were generated as type and worked fine:

export type AddressFamily =
    | 0
    | 1
    | 2
    | 3
    | 4
    <...>
    | 29
    | 65536
    | 65537
    | -1;

latest tested: v12.0.2

Thanks and let me know if you need any extra info

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