What is the significance of the new Reference Classes?

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The request for documentation for ReferenceClasses comes up every now and then, for example on the r-devel list. The best answer so far is to actually look at what help(ReferenceClasses) gives you—which is a pretty decent start.

Then there are a few presentations:

And as noted by mdsummer in the comment, R5 was a short-lived joke. There was already another R-related project called R5, and John much prefers ReferenceClasses. And I reckon they are here to stay. People use them already as e.g. Jeff Horner is his new Rack package.

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