Upper bound interval turns to NA when formatting is applied

[jonas-karlsson]

When applying a label format to the interval, the upper bound becomes NA. Lower bound behaves as expected.

library(tmap)

tm_shape(World) +
  tm_polygons(
    fill = "HPI",
    fill.scale = tm_scale_intervals()
  ) +
  tm_title("No label format applied")
#> [tip] Consider a suitable map projection, e.g. by adding `+ tm_crs("auto")`.
#> This message is displayed once per session.

tm_shape(World) +
  tm_polygons(
    fill = "HPI",
    fill.scale = tm_scale_intervals(
      label.format = list(fun = scales::percent)
    )
  ) +
  tm_title("Label format scales::percent applied")

sessionInfo()
#> R version 4.5.2 (2025-10-31)
#> Platform: aarch64-apple-darwin25.0.0
#> Running under: macOS Tahoe 26.0.1
#> 
#> Matrix products: default
#> BLAS:   /opt/homebrew/Cellar/openblas/0.3.30/lib/libopenblasp-r0.3.30.dylib 
#> LAPACK: /opt/homebrew/Cellar/r/4.5.2/lib/R/lib/libRlapack.dylib;  LAPACK version 3.12.1
#> 
#> locale:
#> [1] C.UTF-8/C.UTF-8/C.UTF-8/C/C.UTF-8/C.UTF-8
#> 
#> time zone: Europe/Zurich
#> tzcode source: internal
#> 
#> attached base packages:
#> [1] stats     graphics  grDevices utils     datasets  methods   base     
#> 
#> other attached packages:
#> [1] tmap_4.2.0.9000
#> 
#> loaded via a namespace (and not attached):
#>  [1] s2_1.1.9           class_7.3-23       lwgeom_0.2-14      KernSmooth_2.23-26
#>  [5] lattice_0.22-7     digest_0.6.37      magrittr_2.0.4     RColorBrewer_1.1-3
#>  [9] evaluate_1.0.5     grid_4.5.2         fastmap_1.2.0      e1071_1.7-16      
#> [13] leafsync_0.1.0     DBI_1.2.3          scales_1.4.0       crosstalk_1.2.2   
#> [17] cols4all_0.10      XML_3.99-0.19      codetools_0.2-20   abind_1.4-8       
#> [21] cli_3.6.5          rlang_1.1.6        units_1.0-0        tmaptools_3.3     
#> [25] reprex_2.1.1       base64enc_0.1-3    withr_3.0.2        yaml_2.3.10       
#> [29] leaflegend_1.2.1   tools_4.5.2        raster_3.6-32      parallel_4.5.2    
#> [33] maptiles_0.10.0    colorspace_2.1-2   spacesXYZ_1.6-0    logger_0.4.1      
#> [37] R6_2.6.1           png_0.1-8          proxy_0.4-27       lifecycle_1.0.4   
#> [41] classInt_0.4-11    leaflet_2.2.3      fs_1.6.6           htmlwidgets_1.6.4 
#> [45] terra_1.8-80       data.table_1.17.8  glue_1.8.0         Rcpp_1.1.0        
#> [49] sf_1.0-21          xfun_0.54          knitr_1.50         farver_2.1.2      
#> [53] htmltools_0.5.8.1  rmarkdown_2.30     leafem_0.2.5       wk_0.9.4          
#> [57] compiler_4.5.2     sp_2.2-0           stars_0.6-8

^{Created on 2025-11-10 with reprex v2.1.1}

EDIT. Wrapping the label.format in tm_label_format produces the same output

library(tmap)

tm_shape(World) +
  tm_polygons(
    fill = "HPI",
    fill.scale = tm_scale_intervals(
      label.format = tm_label_format(
        fun = scales::percent
      )
    )
  ) +
  tm_title("Label format scales::percent applied")
#> [tip] Consider a suitable map projection, e.g. by adding `+ tm_crs("auto")`.
#> This message is displayed once per session.

^{Created on 2025-11-10 with reprex v2.1.1}

[jonas-karlsson]

I've narrowed it down a bit further. If you set interval.disjoint = FALSE it renders correctly (TRUE is default).

library(tmap)

tm_shape(World) +
  tm_polygons(
    fill = "HPI",
    fill.scale = tm_scale_intervals(
      label.format = tm_label_format(
        fun = scales::percent,
        interval.disjoint = FALSE
      )
    )
  ) +
  tm_title("Label format scales::percent applied")
#> [tip] Consider a suitable map projection, e.g. by adding `+ tm_crs("auto")`.
#> This message is displayed once per session.

^{Created on 2025-11-10 with reprex v2.1.1}