
  [;1m-spec round(Number) -> integer() when Number :: number().[0m

  Returns an integer by rounding [;;4mNumber[0m, for example:

    round(42.1).
    42

    round(5.5).
    6

    round(-5.5).
    -6

    round(36028797018963969.0).
    36028797018963968

  In the last example, [;;4mround(36028797018963969.0)[0m evaluates to [;;4m[0m
  [;;4m36028797018963968[0m. The reason for this is that the number [;;4m[0m
  [;;4m36028797018963969.0[0m cannot be represented exactly as a float
  value. Instead, the float literal is represented as [;;4m[0m
  [;;4m36028797018963968.0[0m, which is the closest number that can be
  represented exactly as a float value. See Representation of
  Floating Point Numbers for additional information.

  Allowed in guard tests.
