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‘enc2utf8()’ and ‘enc2native()’ did not always mark the encoding of the return values when it was known.
The third-party code used by ‘strptime()’ rejected time-zone offsets of more than ‘+1200’ (‘+1245’, ‘+1300’ and ‘+1400’ can occur). (PR#15768)
The return value from ‘options(foo = NULL)’ was not the previous value of the option. (PR#15781)