[datatable-help] Infinite numeric key doesn't collapse

[caneff at gmail.com]

I have a numeric key in a data.table that sometimes has infinite values. I
discovered today that Inf does not collapse when used in a by.  Is this
expected? It surprised me:

DT <- data.table(x=rep(c(1,Inf), each=10), y=1:20)

DT[, sum(y), by=x] # The x==1 cases collapse, but the Inf cases don't
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