[datatable-help] strange undocumented data.table error

[talex]

I ran into a strange error that a search only turns up in the commit of
data.table:



This came up upon running a previously tested working dcast.data.table
expression, on a data.table I have subsetted (with duplicates) using a J()
command. The offending section is this:



Strangely, the data I fed it works until a specific row of the input table
is included, and then it dies.



What's bothering data.table? I tried changing keys and messing with the
order of the formula terms just to see, because I don't understand the
error, but that didn't work, of course.



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