[patch] In 'addNA', not call 'factor' if there is NA in levels(x) and no NA in 'x'
factor_diff.txt (text/plain), 422 bytes, created by Suharto Anggono on 2016-05-29 09:56:42 UTC
Creator: Suharto Anggono
Created: 2016-05-29 09:56:42 UTC
Size: 422 bytes

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