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unique

Sequence.unique

filter out duplicate elements.

Keep the order of elements unchanged.

Other languages call this 'distinct' (eg., Java, C# or Kotlin)
or `nub` (Haskell).

ex.

Precondition
pre
  T : property.orderable
0.099dev (GIT hash 9b94ad4b4a4bff2bf2be7d77be2c6e1fd7683c4d)
last changed: 2026-09-23