usmap_crs causes warning

[pdil]

Running usmap::usmap_crs() results in the following warning:

Warning message:
In showSRID(uprojargs, format = "PROJ", multiline = "NO") :
Discarded datum unknown in CRS definition

The associated tests produce the following warnings:

test-transform.R:16: warning: data frame with AK and HI points is transformed
Discarded datum unknown in CRS definition

test-transform.R:16: warning: data frame with AK and HI points is transformed
CRS object has comment, which is lost in output

test-transform.R:16: warning: data frame with AK and HI points is transformed
Discarded datum Unknown based on Normal Sphere (r=6370997) ellipsoid in CRS definition

test-transform.R:16: warning: data frame with AK and HI points is transformed
CRS object has comment, which is lost in output

test-transform.R:16: warning: data frame with AK and HI points is transformed
Discarded datum Unknown based on Normal Sphere (r=6370997) ellipsoid in CRS definition

test-transform.R:32: warning: data frame with AK points is transformed
Discarded datum unknown in CRS definition

test-transform.R:32: warning: data frame with AK points is transformed
CRS object has comment, which is lost in output

test-transform.R:32: warning: data frame with AK points is transformed
Discarded datum Unknown based on Normal Sphere (r=6370997) ellipsoid in CRS definition

test-transform.R:48: warning: data frame with HI points is transformed
Discarded datum unknown in CRS definition

test-transform.R:48: warning: data frame with HI points is transformed
CRS object has comment, which is lost in output

test-transform.R:48: warning: data frame with HI points is transformed
Discarded datum Unknown based on Normal Sphere (r=6370997) ellipsoid in CRS definition

test-transform.R:64: warning: data frame with no AK or HI points is transformed
Discarded datum unknown in CRS definition

Environment

macOS 10.15.7

> version
               _                           
platform       x86_64-apple-darwin17.0     
arch           x86_64                      
os             darwin17.0                  
system         x86_64, darwin17.0          
status                                     
major          4                           
minor          0.2                         
year           2020                        
month          06                          
day            22                          
svn rev        78730                       
language       R                           
version.string R version 4.0.2 (2020-06-22)
nickname       Taking Off Again

> sessionInfo()
R version 4.0.2 (2020-06-22)
Platform: x86_64-apple-darwin17.0 (64-bit)
Running under: macOS Catalina 10.15.7

Matrix products: default
BLAS:   /System/Library/Frameworks/Accelerate.framework/Versions/A/Frameworks/vecLib.framework/Versions/A/libBLAS.dylib
LAPACK: /Library/Frameworks/R.framework/Versions/4.0/Resources/lib/libRlapack.dylib

locale:
[1] en_US.UTF-8/en_US.UTF-8/en_US.UTF-8/C/en_US.UTF-8/en_US.UTF-8

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

loaded via a namespace (and not attached):
 [1] usmap_0.5.1       rstudioapi_0.11   knitr_1.30        magrittr_1.5      maptools_1.0-2   
 [6] munsell_0.5.0     colorspace_1.4-1  lattice_0.20-41   R6_2.4.1          rlang_0.4.7      
[11] tools_4.0.2       grid_4.0.2        gtable_0.3.0      xfun_0.18         tinytex_0.26     
[16] htmltools_0.5.0   ellipsis_0.3.1    yaml_2.2.1        digest_0.6.25     tibble_3.0.3     
[21] lifecycle_0.2.0   crayon_1.3.4.9000 ggplot2_3.3.2     vctrs_0.3.4       glue_1.4.2       
[26] evaluate_0.14     rmarkdown_2.4     sp_1.4-2          pillar_1.4.6      compiler_4.0.2   
[31] scales_1.1.1      foreign_0.8-80    pkgconfig_2.0.3