Appears incompatible with 64 bit integers

[D3SL]

When inputting a dataframe containing an int64 column from data.table's fread() the data gets mangled severely. 16134824562 for example becomes 0.0...0797166251775974 with 313 zeroes after the decimal place. This seems to cause downstream effects like hanging and/or crashing the R session, at least when prototyping in RStudio.