Suggestion Thread: types to add in the future

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I intend to use this issue as a sticky note to hold all ideas of type I had but which I, or someone else will introduce in a later date.
(as I currently write this, the bottleneck of the project isn't the lack of types, but the the lack of testing existing type)

• Static List Length constraint
  StaticListLengthConstaint<T, 5> // T must be of length 5
  useful for specific tuple types

• List No Duplicate
  ListNoDuplicate<[1, false, true, 1]> // fails because one is being duplicated.
  useful to imitate a set, but at compile time

• List No Missing Type
  ListNoMissingType<['key_a', 'key_c'], 'key_a' | 'key_b' | 'key_c'> // fails because ['key_a', 'key_c'] misses 'key_b'
  useful combined to ListNoDuplicate to make a reorder array while ensuring that all element of the array order have been kept