`proxy` of type `double` incompatible with `value` proxy of type `integer`

[JBGruber]

I’m not sure how I originally managed to do this, but somehow when I have an integer duration in a tibble, vec_rbind errors.

library(lubridate)
df <- tibble::tibble(
  # I used dput on the original data.frame to get to this code
  duration = methods::new(
    "Duration",
    .Data = c(
      7200L
    )
  )
)
vctrs::vec_rbind(df, df)

Error in `vctrs::vec_rbind()`:
! `proxy` of type `double` incompatible with `value` proxy of type `integer`.
ℹ In file 'slice-assign.c' at line 254.
ℹ This is an internal error that was detected in the vctrs package.
  Please report it at <https://github.com/r-lib/vctrs/issues> with a reprex (<https://tidyverse.org/help/>) and the full backtrace.

When I tried to reproduce this with a fresh lubridate object, it always saves the duration as a double, at which point the problem disappears:

df <- tibble::tibble(
  duration = methods::new(
    "Duration",
    .Data = c(
      7200
    )
  )
)
vctrs::vec_rbind(df, df)

# A tibble: 2 × 1
  duration        
  <Duration>      
1 7200s (~2 hours)
2 7200s (~2 hours)

Details

sessionInfo()

R version 4.5.2 (2025-10-31)
Platform: x86_64-pc-linux-gnu
Running under: EndeavourOS

Matrix products: default
BLAS:   /usr/lib/libblas.so.3.12.0 
LAPACK: /usr/lib/liblapack.so.3.12.0  LAPACK version 3.12.0

locale:
 [1] LC_CTYPE=en_GB.UTF-8       LC_NUMERIC=C              
 [3] LC_TIME=de_DE.UTF-8        LC_COLLATE=en_GB.UTF-8    
 [5] LC_MONETARY=de_DE.UTF-8    LC_MESSAGES=en_GB.UTF-8   
 [7] LC_PAPER=de_DE.UTF-8       LC_NAME=C                 
 [9] LC_ADDRESS=C               LC_TELEPHONE=C            
[11] LC_MEASUREMENT=de_DE.UTF-8 LC_IDENTIFICATION=C       

time zone: Europe/Berlin
tzcode source: system (glibc)

attached base packages:
[1] stats     graphics  grDevices utils     datasets  methods   base     

other attached packages:
[1] lubridate_1.9.5

loaded via a namespace (and not attached):
 [1] digest_0.6.39    fastmap_1.2.0    xfun_0.55        winch_0.1.2     
 [5] magrittr_2.0.4   glue_1.8.0       tibble_3.3.1     knitr_1.51      
 [9] pkgconfig_2.0.3  htmltools_0.5.9  timechange_0.4.0 rmarkdown_2.30  
[13] generics_0.1.4   lifecycle_1.0.5  cli_3.6.5        vctrs_0.7.1.9000
[17] compiler_4.5.2   tools_4.5.2      pillar_1.11.1    evaluate_1.0.5  
[21] yaml_2.3.12      otel_0.2.0       rlang_1.1.7      jsonlite_2.0.0  

[DavisVaughan]

It would definitely be helpful if you can remember how you created this, because lubridate isn't supposed to ever create an integer backed Duration. That's likely a bug on the lubridate side if you can manage to figure out how to make this through normal means again