pmap converts POSIXct to numeric, but map* functions don't

[ashiklom]

The map* and pmap functions exhibit different behavior when it comes to POSIXct inputs. map* preserves the POSIXct class, but pmap converts them to numeric, which messes up functions like strftime.

library(lubridate)
library(purrr)

l <- list(
  date = as_date("2010-01-01") + dhours(1:2)
)

f <- function(date) {
  print(class(date))
  print(date)
  strftime(date, "%H")
}

map(l$date, f)
# [1] "POSIXct" "POSIXt" 
# [1] "2010-01-01 01:00:00 UTC"
# [1] "POSIXct" "POSIXt" 
# [1] "2010-01-01 02:00:00 UTC"
# [[1]]
# [1] "20"
# 
# [[2]]
# [1] "21"
# 
try(pmap(l, f))
# [1] "numeric"
# [1] 1262307600
# [1] "Error in as.POSIXlt.numeric(x, tz = tz) : 'origin' must be supplied"

[jennybc]

Duplicate of #358

[ashiklom]

Oops, sorry. Thought I searched for this, but apparently not carefully enough. Closing as duplicate.