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Looking up stroke() in the reference reveals this:
When drawing in 2D with the default renderer, you may need hint(ENABLE_STROKE_PURE) to improve drawing quality (at the expense of performance). See the hint() documentation for more details.
So, naturally I tried to look up hint() next, which does not exist. A search however revealed this little gem:
Posted by GoToLoop, December 2013:
Processing devs are trying to create an API official cannon! Things like hint(), thread(""), delay(), JAVA2D, etc. are to remain hidden from public view!
So, hint exists but is deemed 'top secret' so us peons don't hurt ourselves, or it does not and the help page is there as a social experiment to see how many people figure it is worth the time to post about? If so, does that mean I win?
A year and a half is a long time to stay out of step....