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A general description is here.
The default method of ‘image()’ has an explicit check for a numeric or logical matrix (which was always required).
‘cbind()’ and ‘rbind()’ now consider S4 inheritance during S3 dispatch and also obey ‘deparse.level’.
Building the manuals now requires ‘texi2any’ from ‘texinfo’ 5.1 or later. CRAN binary builds include the manuals, but by default builds from source will not, and they will be accessed from CRAN. See the comments in ‘src/gnuwin32/MkRules.dist’ for how to specify the location of ‘texi2any’.
Rare over-runs detected by AddressSanitizer in ‘substr()’ and its replacement version have been avoided.
_Inter alia_ that fix gives the documented behaviour for ‘substr(x, 1, 2) <- ""’ (subsequently reported as PR#16214).