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defprotocol Utility do
@spec type(t) :: String.t()
def type(value)
enddefimpl Utility, for: BitString do
def type(_value), do: "string"
end
defimpl Utility, for: Integer do
def type(_value), do: "integer"
endUtility.type("string")
Utility.type(123)
Utility.type([])
