obj_sizes gives NA for objects larger than 2^31 bytes

[thornend]

library(lobstr)
n <- 1.343E8
largeframe <- data.frame(runif(n), 
                         sample(LETTERS, n, T), 
                         sample(letters, n, T))
largecopy <- largeframe
obj_size(largeframe, largecopy)
obj_sizes(largeframe, largecopy)