Uniq.UUID.string_to_binary-exclamation-mark

You're seeing just the function string_to_binary-exclamation-mark, go back to Uniq.UUID module for more information.

Specs

string_to_binary!(String.t()) :: t() | no_return()

This function takes a UUID string in any of the formats supported by to_string/1, and returns the raw, binary-encoded form.