Add vctrs support

[hadley]

Something like this:

library(vctrs)

vec_cast.hms <- function(x, to) UseMethod("vec_cast.hms")
vec_cast.hms.default <- function(x, to) stop_incompatible_cast(x, to)
vec_cast.hms.logical <- function(x, to) vec_unspecified_cast(x, to)
vec_cast.hms.hms <- function(x, to) x

vec_cast.hms.difftime <- function(x, to) hms::as.hms(x)
vec_cast.difftime.hms <- function(x, to) as.difftime(x)

vec_type2.hms <- function(x, y) UseMethod("vec_type2.hms")
vec_type2.hms.default           <- function(x, y) stop_incompatible_type(x, y)
vec_type2.hms.vctrs_unspecified <- function(x, y) x
vec_type2.hms.vctrs_percent     <- function(x, y) x
vec_type2.hms.hms               <- function(x, y) hms::hms()

vec_type2.difftime.hms          <- function(x, y) new_difftime(units = units(x))
vec_type2.hms.difftime          <- function(x, y) new_difftime(units = units(y))


library(hms)
time <- hms(5)
vec_c(time, time + 0:10 * 900)
#> 00:00:05
#> 00:00:05
#> 00:15:05
#> 00:30:05
#> 00:45:05
#> 01:00:05
#> 01:15:05
#> 01:30:05
#> 01:45:05
#> 02:00:05
#> 02:15:05
#> 02:30:05

^{Created on 2018-10-30 by the reprex package (v0.2.1)}

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