Daily News about R-2-10-branch/NEWS
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2.10.1 patched BUG FIXES
Functions related to string comparison (e.g. unique(), match())
could cause crashes when used with strings not in the native
encoding, e.g. UTF-8 strings on Windows.
(PR#14114 and PR#14125)
x[ , drop=TRUE] dropped an NA level
, even if it was in use.