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A general description is here.
The ‘model.frame()’ method for ‘"lm"’ uses ‘xlevels’: this is safer if ‘data’ was supplied or ‘model = FALSE’ was used and the levels of factors used in the fit had been re-ordered since fitting.
Similarly, ‘model.frame(fm, data=<data>)’ copies across the variables used for safe prediction from the fit.
Reference class methods (in the ‘methods’ package) that use other methods in an indirect way (e.g., by ‘sapply()’) must tell the code analysis to include that method. They can now do so by invoking ‘$usingMethods()’.
In ‘ns()’ and ‘bs()’, specifying ‘knots = NULL’ is now equivalent to omitting it, also when ‘df’ is specified. (PR#14970)