%% %CopyrightBegin%
%%
%% SPDX-License-Identifier: Apache-2.0
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[;1m  truncate(IoDevice)[0m

  Truncates the file referenced by [;;4mIoDevice[0m at the current
  position. Returns [;;4mok[0m if successful, otherwise [;;4m{error, Reason}[0m.
