[datatable-help] What does "problem re-suffixing the merged data.table" mean?

[Allan Engelhardt (CYBAEA)]

What does the warning mean?  What sort of problem?

model.data <- merge(Y1, Y2, all = FALSE, suffixes = c(".Y1", ".Y2"))
Warning message:
In merge.data.table(Y1, Y2, all = FALSE, suffixes = c(".Y1", ".Y2")) :
   There was a problem re-suffixing the merged data.table. The merge was 
succesful, but the default column naming has been used (ie. suffixes 
were set to c('', '.1').

It doesn't seem to matter what value I use for suffixes=

Allan

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