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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
0.097dev (GIT hash 6a5de4939ddf29875c1d9a706508d9bfd0cd7ca9)
last changed: 2026-06-09