Sorry for giving this feedback so close to plenary.

I think that .windows and .sliding are both good names individually, but they are terrible names if we are going to have both methods.

Both methods are a "sliding window" over the underlying iterator, and neither name hints at how they are different. I understand that the .sliding name was chosen following Scala's precedent, but:

• Scala doesn't have a .windows method, so there is no confusion there
• Scala's .sliding docs literally mention "sliding window".

I would very much prefer the two methods to share the same prefix in the name, with a "modifier" that tells how they are different. Ideally, I'd start typing something in my editor and both would show up. Some ideas:

• windows/windowAllowShorter
• windows/windowOrShorter
• windowsStrictSize/windows
• windowsOrEmpty/windows
• windowsTry/windows