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Fix problems in command completion: Crash (PR#17222) and junk display in Windows, handling special characters in filenames on all systems.
‘match(x, t)’, ‘duplicated(x)’ and ‘unique(x)’ work as documented for complex numbers with ‘NA’s or ‘NaN’s, where all those containing ‘NA’ do match, whereas in the case of ‘NaN’'s both real and imaginary parts must match, compatibly with how ‘print()’ and ‘format()’ work for complex numbers.