Terry J. Reedy added the comment: 'name=val' in a signature (not a call) merely indicates that name has a default. The 2.x use of [] to indicate the the parameter with a default is optional was dropped as redundant in the 3.x docs. The 2.x; tee doc has [, n=2]. The 3.x doc is correctly according to the 3.x doc standard.
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