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+The new [CategoryAliases] map provides access to category alias names, such as “Letter” for “L”.
+The new categories [Cn] and [LC] define unassigned codepoints and cased letters, respectively.
+These have always been defined by Unicode but were inadvertently omitted in earlier versions of Go.
+The [C] category now includes [Cn], meaning it has added all unassigned code points.