You're seeing just the function init, go back to Kcl.State module for more information.
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init(our_private, our_public \\ nil)

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init(Kcl.key(), Kcl.key() | nil) :: t()

Initialize a new state

The private key will be used to derive the public one, if such is not supplied. There is, otherwise, no verification that the supplied keys form a valid pair.