"replace" is prefixing in `with_temp_libpaths` and friends

[AlexAxthelm]

Hi, thanks for the great package! As I was writing some tests today, I was working with with_libpath() and with_temp_libpath(), and I've found that even when explicitly specifying the "replace" action, the previous libpaths are still showing up.

Any suggestions on how to do a complete replacement (so that the previous libpaths don't show up to the code in the code block)?

.libPaths()
#> [1] "/opt/homebrew/lib/R/4.3/site-library"      
#> [2] "/opt/homebrew/Cellar/r/4.3.2/lib/R/library"
withr::with_temp_libpaths(action = "replace", code = {.libPaths()})
#> [1] "/private/var/folders/g8/1kf0nz093f3gmy0t9yhtwbq00000gn/T/RtmpKG33Gv/temp_libpath1108a599977c1"
#> [2] "/opt/homebrew/lib/R/4.3/site-library"                                                         
#> [3] "/opt/homebrew/Cellar/r/4.3.2/lib/R/library"

^{Created on 2024-03-19 with reprex v2.0.2}

Session info

sessioninfo::session_info()
#> ─ Session info ───────────────────────────────────────────────────────────────
#>  setting  value
#>  version  R version 4.3.2 (2023-10-31)
#>  os       macOS Sonoma 14.2
#>  system   aarch64, darwin23.0.0
#>  ui       unknown
#>  language (EN)
#>  collate  en_US.UTF-8
#>  ctype    en_US.UTF-8
#>  tz       Europe/Belgrade
#>  date     2024-03-19
#>  pandoc   3.1.7 @ /opt/homebrew/bin/ (via rmarkdown)
#> 
#> ─ Packages ───────────────────────────────────────────────────────────────────
#>  package     * version date (UTC) lib source
#>  cli           3.6.2   2023-12-11 [1] CRAN (R 4.3.2)
#>  digest        0.6.35  2024-03-11 [1] CRAN (R 4.3.2)
#>  evaluate      0.23    2023-11-01 [1] CRAN (R 4.3.2)
#>  fastmap       1.1.1   2023-02-24 [1] CRAN (R 4.3.2)
#>  fs            1.6.3   2023-07-20 [1] CRAN (R 4.3.2)
#>  glue          1.7.0   2024-01-09 [1] CRAN (R 4.3.2)
#>  htmltools     0.5.7   2023-11-03 [1] CRAN (R 4.3.2)
#>  knitr         1.45    2023-10-30 [1] CRAN (R 4.3.2)
#>  lifecycle     1.0.4   2023-11-07 [1] CRAN (R 4.3.1)
#>  magrittr      2.0.3   2022-03-30 [1] CRAN (R 4.3.2)
#>  purrr         1.0.2   2023-08-10 [1] CRAN (R 4.3.2)
#>  R.cache       0.16.0  2022-07-21 [1] CRAN (R 4.3.1)
#>  R.methodsS3   1.8.2   2022-06-13 [1] CRAN (R 4.3.1)
#>  R.oo          1.25.0  2022-06-12 [1] CRAN (R 4.3.1)
#>  R.utils       2.12.2  2022-11-11 [1] CRAN (R 4.3.1)
#>  reprex        2.0.2   2022-08-17 [1] CRAN (R 4.3.1)
#>  rlang         1.1.3   2024-01-10 [1] CRAN (R 4.3.2)
#>  rmarkdown     2.25    2023-09-18 [1] CRAN (R 4.3.1)
#>  sessioninfo   1.2.2   2021-12-06 [1] CRAN (R 4.3.1)
#>  styler        1.10.2  2023-08-29 [1] CRAN (R 4.3.1)
#>  vctrs         0.6.5   2023-12-01 [1] CRAN (R 4.3.2)
#>  withr         3.0.0   2024-01-16 [1] CRAN (R 4.3.2)
#>  xfun          0.41    2023-11-01 [1] CRAN (R 4.3.2)
#>  yaml          2.3.8   2023-12-11 [1] CRAN (R 4.3.2)
#> 
#>  [1] /opt/homebrew/lib/R/4.3/site-library
#>  [2] /opt/homebrew/Cellar/r/4.3.2/lib/R/library
#> 
#> ──────────────────────────────────────────────────────────────────────────────