
  [;1m-type time_unit() ::[0m
  [;1m          pos_integer() |[0m
  [;1m          second | millisecond | microsecond | nanosecond | native |[0m
  [;1m          perf_counter |[0m
  [;1m          deprecated_time_unit().[0m

  Supported time unit representations:

  [;;4m[;;4mPartsPerSecond :: integer() >= 1[0m[0m:
    Time unit expressed in parts per second. That is, the time
    unit equals [;;4m1/PartsPerSecond[0m second.

  [;;4m[;;4msecond[0m[0m:
    Symbolic representation of the time unit represented by the
    integer [;;4m1[0m.

  [;;4m[;;4mmillisecond[0m[0m:
    Symbolic representation of the time unit represented by the
    integer [;;4m1000[0m.

  [;;4m[;;4mmicrosecond[0m[0m:
    Symbolic representation of the time unit represented by the
    integer [;;4m1000_000[0m.

  [;;4m[;;4mnanosecond[0m[0m:
    Symbolic representation of the time unit represented by the
    integer [;;4m1000_000_000[0m.

  [;;4m[;;4mnative[0m[0m:
    Symbolic representation of the native time unit used by the
    Erlang runtime system.

    The [;;4mnative[0m time unit is determined at runtime system start,
    and remains the same until the runtime system terminates. If a
    runtime system is stopped and then started again (even on the
    same machine), the [;;4mnative[0m time unit of the new runtime
    system instance can differ from the [;;4mnative[0m time unit of the
    old runtime system instance.

    One can get an approximation of the [;;4mnative[0m time unit by
    calling [;;4merlang:convert_time_unit(1, second, native)[0m. The
    result equals the number of whole [;;4mnative[0m time units per
    second. If the number of [;;4mnative[0m time units per second does
    not add up to a whole number, the result is rounded downwards.

    Note:
      The value of the [;;4mnative[0m time unit gives you more or less
      no information about the quality of time values. It sets a
      limit for the resolution and for the precision of time
      values, but it gives no information about the accuracy
      of time values. The resolution of the [;;4mnative[0m time unit
      and the resolution of time values can differ
      significantly.

  [;;4m[;;4mperf_counter[0m[0m:
    Symbolic representation of the performance counter time unit
    used by the Erlang runtime system.

    The [;;4mperf_counter[0m time unit behaves much in the same way as
    the [;;4mnative[0m time unit. That is, it can differ between runtime
    restarts. To get values of this type, call [;;4mos:perf_counter/0[0m.

  [;;4m[;;4mdeprecated_time_unit()[0m[0m:
    Deprecated symbolic representations kept for
    backwards-compatibility.

  The [;;4mtime_unit/0[0m type can be extended. To convert time values
  between time units, use [;;4merlang:convert_time_unit/3[0m.
