Gather turns date column into integer

[dncnbrn]

I'm sure this hasn't been a problem before now, but when I use gather on a data frame which has a date column (NB: the date column isn't being gathered into key/value), it changes the dates to integers. Here's a minimum example:

library(tidyr)

data.frame(x=rnorm(10),y=rnorm(10),date=seq.Date(as.Date("2005-01-01"),,by=1,length.out=10)) %>%
  gather(a, key,value,x,y)

And here's the first five rows of output:

date   key       value

12784 x 1.16951115
12785 x -0.65827450
12786 x -0.33643075
12787 x -0.94782685
12788 x -0.44513446

Here's my session info:

R version 3.2.2 (2015-08-14)
Platform: x86_64-w64-mingw32/x64 (64-bit)
Running under: Windows 8 x64 (build 9200)

locale:
[1] LC_COLLATE=English_United States.1252  LC_CTYPE=English_United States.1252    LC_MONETARY=English_United States.1252 LC_NUMERIC=C                          
[5] LC_TIME=English_United States.1252    

attached base packages:
[1] stats     graphics  grDevices utils     datasets  methods   base     

other attached packages:
[1] tidyr_0.3.0

loaded via a namespace (and not attached):
 [1] Rcpp_0.12.0      assertthat_0.1   dplyr_0.4.3      digest_0.6.8     MASS_7.3-44      R6_2.1.1         grid_3.2.2       plyr_1.8.3       DBI_0.3.1       
[10] gtable_0.1.2     magrittr_1.5     scales_0.3.0     ggplot2_1.0.1    stringi_0.5-5    lazyeval_0.1.10  reshape2_1.4.1   ggthemes_2.2.1   proto_0.3-10    
[19] tools_3.2.2      stringr_1.0.0    munsell_0.4.2    parallel_3.2.2   colorspace_1.2-6

Any help gratefully received.

[hadley]

Duplicate of #104 - Already fixed in dev version and on its way to CRAN.