The wk_crs_equal() function uses special S3 dispatch on wk_crs_equal_generic()
to evaluate whether or not two CRS values can be considered equal. When implementing
wk_crs_equal_generic(), every attempt should be made to make wk_crs_equal(x, y)
and wk_crs_equal(y, x) return identically.
wk_crs_equal(x, y)
wk_crs_equal_generic(x, y, ...)TRUE if x and y can be considered equal, FALSE otherwise.