R Under development (unstable) (2023-12-13 r85679 ucrt) -- "Unsuffered Consequences"
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Platform: x86_64-w64-mingw32/x64

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> suppressPackageStartupMessages(library(sf))
> 
> if (require(maps, quietly = TRUE)) {
+  m = map(xlim = c(4,9), ylim = c(48,55), fill = TRUE, plot = FALSE)
+  st_as_sf(m)
+  m = map(xlim = c(4,9), ylim = c(48,55), plot = FALSE)
+  st_as_sf(m, fill = FALSE)
+  st_as_sf(map(), fill = FALSE)
+  st_as_sf(map(fill = TRUE))
+  st_as_sf(map(), fill = FALSE, group = FALSE)
+  st_as_sf(map(fill = TRUE), group = FALSE)
+ }
Simple feature collection with 1627 features and 1 field
Geometry type: MULTIPOLYGON
Dimension:     XY
Bounding box:  xmin: -180 ymin: -85.19218 xmax: 190.2708 ymax: 83.59961
Geodetic CRS:  +proj=longlat +ellps=clrk66 +no_defs +type=crs
First 10 features:
                                                                 ID
Aruba                                                         Aruba
Afghanistan                                             Afghanistan
Angola                                                       Angola
Angola:Cabinda                                       Angola:Cabinda
Anguilla                                                   Anguilla
Albania                                                     Albania
Finland:Aland Islands:Foglo             Finland:Aland Islands:Foglo
Finland:Aland Islands:Eckero           Finland:Aland Islands:Eckero
Finland:Aland Islands:Fasta Aland Finland:Aland Islands:Fasta Aland
Andorra                                                     Andorra
                                                            geom
Aruba                             MULTIPOLYGON (((-69.89912 1...
Afghanistan                       MULTIPOLYGON (((74.89131 37...
Angola                            MULTIPOLYGON (((23.9665 -10...
Angola:Cabinda                    MULTIPOLYGON (((12.21367 -5...
Anguilla                          MULTIPOLYGON (((-63.00122 1...
Albania                           MULTIPOLYGON (((20.06396 42...
Finland:Aland Islands:Foglo       MULTIPOLYGON (((20.61133 60...
Finland:Aland Islands:Eckero      MULTIPOLYGON (((19.6623 60....
Finland:Aland Islands:Fasta Aland MULTIPOLYGON (((19.98955 60...
Andorra                           MULTIPOLYGON (((1.706055 42...
> 
> proc.time()
   user  system elapsed 
   1.53    0.31    1.82