Problem with View() and difftime fields - daily desktop build

daily

#1

On the latest daily desktop build (Version 1.2.730 Build 754 (e1a72523)) the code below fails with, Error in hist.default(hist_vals, plot = FALSE) : 'x' must be numeric.

Version 1.2.665 (for example) does not fail.

obs <- 1:10                                                                  
d1 <- sample(seq(as.Date('2015-01-01'), as.Date('2016-01-01'), by="day"), 10)
d2 <- sample(seq(as.Date('2017-01-01'), as.Date('2018-01-01'), by="day"), 10)
delta <- difftime(d2, d1)                                                    
View(delta)                                                                  

R version 3.5.0 (2018-04-23)
Platform: x86_64-w64-mingw32/x64 (64-bit)
Running under: Windows 7 x64 (build 7601) Service Pack 1