[datatable-help] key<- messes with my factors

[Matthew Dowle]

The documentation/error message could be improved (e.g. setkey could warn
when it sees ordered factors) but, currently at least, it's by design.  Once
floating point and raw character are allowed in keys (progress is happening
behind the scenes) hopefully it either goes away, or we could change to
cater for ordered factors (which don't have ordered levels) as it wouldn't
rely on ordered factor levels.

More background here :

http://r.789695.n4.nabble.com/Factors-may-lose-ordered-class-when-used-as-keys-tp3578759p3578759.html

and two workarounds here :

http://r.789695.n4.nabble.com/Behavior-of-setkey-with-factors-tp2319612p2319612.html




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