A.Enum.split

You're seeing just the function split, go back to A.Enum module for more information.
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split(enumerable, amount)

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Specs

split(t(val), integer()) :: {[val], [val]} when val: value()

Splits the enumerable into two enumerables, leaving count elements in the first one.

Mirrors Enum.split/2 with higher performance for Aja structures.