router modified in place causing duplicate routes

[JosiahParry]

System details

Output of sessioninfo::session_info()():

─ Session info ─────────────────────────────────────────────────
 setting  value
 version  R Under development (unstable) (2025-02-08 r87709)
 os       macOS Sequoia 15.0.1
 system   aarch64, darwin20
 ui       X11
 language (EN)
 collate  en_US.UTF-8
 ctype    en_US.UTF-8
 tz       America/Los_Angeles
 date     2025-03-09
 pandoc   3.2.1 @ /opt/homebrew/bin/ (via rmarkdown)
 quarto   1.6.40 @ /usr/local/bin/quarto

─ Packages ─────────────────────────────────────────────────────
 package     * version date (UTC) lib source
 callr         3.7.6   2024-03-25 [1] CRAN (R 4.5.0)
 cli           3.6.4   2025-02-13 [1] CRAN (R 4.5.0)
 clipr         0.8.0   2022-02-22 [1] CRAN (R 4.5.0)
 data.table    1.17.0  2025-02-22 [1] CRAN (R 4.5.0)
 digest        0.6.37  2024-08-19 [1] CRAN (R 4.5.0)
 evaluate      1.0.3   2025-01-10 [1] CRAN (R 4.5.0)
 fastmap       1.2.0   2024-05-15 [1] CRAN (R 4.5.0)
 fs            1.6.5   2024-10-30 [1] CRAN (R 4.5.0)
 glue          1.8.0   2024-09-30 [1] CRAN (R 4.5.0)
 htmltools     0.5.8.1 2024-04-04 [1] CRAN (R 4.5.0)
 knitr         1.49    2024-11-08 [1] CRAN (R 4.5.0)
 lifecycle     1.0.4   2023-11-07 [1] CRAN (R 4.5.0)
 magrittr      2.0.3   2022-03-30 [1] CRAN (R 4.5.0)
 pillar        1.10.1  2025-01-07 [1] CRAN (R 4.5.0)
 pkgconfig     2.0.3   2019-09-22 [1] CRAN (R 4.5.0)
 processx      3.8.6   2025-02-21 [1] CRAN (R 4.5.0)
 ps            1.9.0   2025-02-18 [1] CRAN (R 4.5.0)
 R6            2.6.1   2025-02-15 [1] CRAN (R 4.5.0)
 reprex        2.1.1   2024-07-06 [1] CRAN (R 4.5.0)
 rlang         1.1.5   2025-01-17 [1] CRAN (R 4.5.0)
 rmarkdown     2.29    2024-11-04 [1] CRAN (R 4.5.0)
 rstudioapi    0.17.1  2024-10-22 [1] CRAN (R 4.5.0)
 sessioninfo   1.2.3   2025-02-05 [1] CRAN (R 4.5.0)
 tibble        3.2.1   2023-03-20 [1] CRAN (R 4.5.0)
 vctrs         0.6.5   2023-12-01 [1] CRAN (R 4.5.0)
 withr         3.0.2   2024-10-28 [1] CRAN (R 4.5.0)
 xfun          0.51    2025-02-19 [1] CRAN (R 4.5.0)
 yaml          2.3.10  2024-07-26 [1] CRAN (R 4.5.0)

 [1] /Users/josiahparry/Library/R/arm64/4.5/library
 [2] /Library/Frameworks/R.framework/Versions/4.5-arm64/Resources/library

────────────────────────────────────────────────────────────────

Example application or steps to reproduce the problem

library(plumber)
pr <- pr() 
for (i in 1:5) {
  pr_get(pr, "/hi", function() "Hello World")
}

pr
#> # Plumber router with 5 endpoints, 4 filters, and 0 sub-routers.
#> # Use `pr_run()` on this object to start the API.
#> ├──[queryString]
#> ├──[body]
#> ├──[cookieParser]
#> ├──[sharedSecret]
#> └──/hi (GET, GET, GET, GET, GET)

^{Created on 2025-03-09 with reprex v2.1.1}

Describe the problem in detail

Running a route handler multiple times on the same pr object, even without assignment, adds another endpoint.