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(Windows only) Tcl/Tk version 8.6.4 is now included in the binary builds. The ‘tcltk*.chm’ help file is no longer included; please use <URL: http://www.tcl.tk/man/> instead.
Illegal factors, e.g., with duplicated levels (illegal but constructable) now give a warning when printed, via new ‘.valid.factor’.
‘str(<looooooooong_string>)’ is no longer very slow; inspired by Mikko Korpela's proposal in PR#16527.