unordered enum for better interoperability with C (#23585)

ref https://forum.nim-lang.org/t/11564
```nim
block: # unordered enum
  block:
    type
      unordered_enum = enum
        a = 1
        b = 0

    doAssert (ord(a), ord(b)) == (1, 0)

  block:
    type
      unordered_enum = enum
        a = 1
        b = 0
        c

    doAssert (ord(a), ord(b), ord(c)) == (1, 0, 2)

  block:
    type
      unordered_enum = enum
        a = 100
        b
        c = 50
        d

    doAssert (ord(a), ord(b), ord(c), ord(d)) == (100, 101, 50, 51)

  block:
    type
      unordered_enum = enum
        a = 7
        b = 6
        c = 5
        d

    doAssert (ord(a), ord(b), ord(c), ord(d)) == (7, 6, 5, 8)
```

0 files changed, 0 insertions, 0 deletions