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A general description is here.
New functions ‘validEnc()’ and ‘validUTF8()’ to give access to the validity checks for inputs used by ‘grep()’ and friends.
‘str(x)’ now displays ‘"Time-Series"’ also for matrix (multivariate) time-series, i.e. when ‘is.ts(x)’ is true.
‘nchar(x, *)’ gains a new argument ‘keepNA’ which governs how the result for ‘NA’s in ‘x’ is determined.
‘utf8ToInt()’ now checks that its input is valid UTF-8 and returns ‘NA’ if it is not.
Under some circumstances ‘nchar(x, "c")’ and ‘nchar(x, "w")’ would return values (possibly ‘NA’) for inputs which were declared to be UTF-8 but were not, or for invalid strings without a marked encoding in a multi-byte locale.