Consider `vec_proxy()` and `vec_restore()` methods for IDate

[DavisVaughan]

From https://github.com/tidyverse/dplyr/issues/6687

library(vctrs)
library(data.table)

x <- as.IDate("2017-06-05")
class(x)
#> [1] "IDate" "Date"

typeof(x)
#> [1] "integer"

typeof(vec_slice(x, 1))
#> [1] "double"

# Because of
typeof(vec_proxy(x))
#> [1] "double"

# Proxy is inherited from Date, which normalizes to double
vctrs:::vec_proxy.Date
#> function (x, ...) 
#> {
#>     date_validate(x)
#> }
#> <bytecode: 0x7fedebbeb8f0>
#> <environment: namespace:vctrs>

[buggaby]

I'm seeing this occur with a filter call on a data.table. Is this the same issue?

Dates = as.IDate(c("2018-04-02", "2018-04-03", "2018-04-04"))
Letters = c("A", "B", "C")
dt = data.table(Date = Dates, Letter = Letters)

dt %>%
    pull(Date) %>%
    typeof()
#> [1] "integer"

dt %>%
    filter(Letter != "A") %>%
    pull(Date) %>%
    typeof()
#> [1] "double"

[muschellij2]

This relates to @tidyverse dplyr too, which I don't think is expected behavior.

x = structure(1509375600L, class = c("POSIXct", "POSIXt"), tzone = "UTC")
typeof(x)
#> [1] "integer"

dplyr::first(x)
#> [1] "2017-10-30 15:00:00 UTC"

typeof(vctrs::vec_slice(x, 1L))
#> [1] "double"

typeof(dplyr::first(x))
#> [1] "double"

^{Created on 2024-07-15 with reprex v2.1.0}

Session info

``` r sessioninfo::session_info() #> ─ Session info ─────────────────────────────────────────────────────────────── #> setting value #> version R version 4.4.0 (2024-04-24) #> os macOS Sonoma 14.4.1 #> system x86_64, darwin20 #> ui X11 #> language (EN) #> collate en_US.UTF-8 #> ctype en_US.UTF-8 #> tz America/New_York #> date 2024-07-15 #> pandoc 3.2 @ /usr/local/bin/ (via rmarkdown) #> #> ─ Packages ─────────────────────────────────────────────────────────────────── #> package * version date (UTC) lib source #> cli 3.6.2 2023-12-11 [1] CRAN (R 4.4.0) #> digest 0.6.35 2024-03-11 [1] CRAN (R 4.4.0) #> dplyr 1.1.4 2023-11-17 [1] CRAN (R 4.4.0) #> evaluate 0.23 2023-11-01 [1] CRAN (R 4.4.0) #> fansi 1.0.6 2023-12-08 [1] CRAN (R 4.4.0) #> fastmap 1.2.0 2024-05-15 [1] CRAN (R 4.4.0) #> fs 1.6.4 2024-04-25 [1] CRAN (R 4.4.0) #> generics 0.1.3 2022-07-05 [1] CRAN (R 4.4.0) #> glue 1.7.0 2024-01-09 [1] CRAN (R 4.4.0) #> htmltools 0.5.8.1 2024-04-04 [1] CRAN (R 4.4.0) #> knitr 1.46 2024-04-06 [1] CRAN (R 4.4.0) #> lifecycle 1.0.4 2023-11-07 [1] CRAN (R 4.4.0) #> magrittr 2.0.3 2022-03-30 [1] CRAN (R 4.4.0) #> pillar 1.9.0 2023-03-22 [1] CRAN (R 4.4.0) #> pkgconfig 2.0.3 2019-09-22 [1] CRAN (R 4.4.0) #> purrr 1.0.2 2023-08-10 [1] CRAN (R 4.4.0) #> R.cache 0.16.0 2022-07-21 [1] CRAN (R 4.4.0) #> R.methodsS3 1.8.2 2022-06-13 [1] CRAN (R 4.4.0) #> R.oo 1.26.0 2024-01-24 [1] CRAN (R 4.4.0) #> R.utils 2.12.3 2023-11-18 [1] CRAN (R 4.4.0) #> R6 2.5.1 2021-08-19 [1] CRAN (R 4.4.0) #> reprex 2.1.0 2024-01-11 [1] CRAN (R 4.4.0) #> rlang 1.1.3 2024-01-10 [1] CRAN (R 4.4.0) #> rmarkdown 2.27 2024-05-17 [1] CRAN (R 4.4.0) #> rstudioapi 0.16.0 2024-03-24 [1] CRAN (R 4.4.0) #> sessioninfo 1.2.2 2021-12-06 [1] CRAN (R 4.4.0) #> styler 1.10.3 2024-04-07 [1] CRAN (R 4.4.0) #> tibble 3.2.1 2023-03-20 [1] CRAN (R 4.4.0) #> tidyselect 1.2.1 2024-03-11 [1] CRAN (R 4.4.0) #> utf8 1.2.4 2023-10-22 [1] CRAN (R 4.4.0) #> vctrs 0.6.5 2023-12-01 [1] CRAN (R 4.4.0) #> withr 3.0.0 2024-01-16 [1] CRAN (R 4.4.0) #> xfun 0.44 2024-05-15 [1] CRAN (R 4.4.0) #> yaml 2.3.8 2023-12-11 [1] CRAN (R 4.4.0) #> #> [1] /Library/Frameworks/R.framework/Versions/4.4-x86_64/Resources/library #> #> ────────────────────────────────────────────────────────────────────────────── ```