type TMyEnumHelper = record helper for TMyEnum
You can extend enums too. https://docwiki.embarcadero.com/RADStudio/Sydney/en/Class_and_Record_Helpers_(Delphi) suggests you cannot, but https://www.thoughtco.com/record-helpers-for-sets-1058204 and actual test with Delphi 12 shows you can:
| Public | function GetNext: TMyEnum; |
| Public | function GetNext: TMyEnum; |
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