The wk package doesn't operate on CRS objects, but does propagate them through subsetting and concatenation. A CRS object can be any R object, and x can be any object whose 'crs' attribute carries a CRS. These functions are S3 generics to keep them from being used on objects that do not use this system of CRS propagation.
wk_crs(x) # S3 method for wk_vctr wk_crs(x) # S3 method for wk_rcrd wk_crs(x) wk_crs(x) <- value wk_set_crs(x, crs) wk_crs_output(...)
Objects whose "crs" attribute is used to carry a CRS.
An object that can be interpreted as a CRS