When should one use "optional" versus "default" in docstrings? I've noticed a lot of variation in the files in /src/sage/. Often, "optional" is used if the argument in question defaults to "None", but I also see "(default: None)" or "(default: ``None``)". On the other hand, I also see examples of "optional" being used when the argument defaults to something other than None, e.g., -1.
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