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A general description is here.
Directories are now omitted by ‘file.copy(,recursive = FALSE)’ and in ‘file.append()’ (PR#17337).
‘gsub()’ and ‘sub()’ are now more robust to integer overflow when reporting errors caused by too large input strings (PR#18346).
Top-level handlers are now more robust to attempts to remove a handler whilst handlers are running (PR#18508).
The handling of ‘Alt+F4’ in dialogs created on Windows using GraphApp has been fixed (PR#13870).
‘density()’ more consistently computes grid values for the FFT based convolution, following Robert Schlicht's analysis and proposal in PR#18337, correcting density values typically by a factor of about 0.999. Optional ‘old.coords=TRUE’ provides back compatibility.
The C-level API version of R's ‘integrate()’, ‘Rdqags()’ in ‘Applic.h’, now returns the correct number of integrand evaluations ‘neval’, fixing PR#18515 reported and diagnosed by Stephen Wade.
‘.S3methods()’, typically called from ‘methods()’, again marks methods from package ‘base’ as ‘visible’.