Immutable.List.isSuperset() TypeError

HTML

<script src="https://cdn.jsdelivr.net/immutable.js/3.6.4/immutable.min.js"></script>

JavaScript

// Works...
Immutable.List.of(1, 2, 3).isSuperset(Immutable.List.of(1, 2));
// true

// Doesn't work...
Immutable.List.of(1, 2, 3).isSuperset([ 1, 2 ]);
// Uncaught TypeError: t.isSubset is not a function(…)

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Immutable.List.isSuperset() TypeError

HTML

JavaScript

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