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The ‘plot.TukeyHSD()’ function now uses a line width of 0.5 for its reference lines rather than ‘lwd = 0’ (which caused problems for some PDF and PostScript viewers).
The rendering of numbers in plotmath expressions (e.g. ‘expression(10^2)’) used the current settings for conversion to strings rather than setting the defaults, and so could be affected by what has been done before. (PR#14477)
Reference S4 class creation could generate ambiguous inheritance patterns under very special circumstances.