resolve warning about datum, in logs/console, when web app tries to upload/read some shapefiles

[ejanalysis]

Messages or warnings printed to console also get logged and clutter the log if not useful.

This is OK:
library(EJAM)
shapefile_from_any(testshapes_2)

Launch app like this, for example:

library(EJAM)
ejamapp(shp=testdata("portland_shp.zip",quiet=T), default_testing=T)

or like this:

library(EJAM)
ejamapp(shp= testshapes_2, default_testing=T)

As it starts to read the file or object, it immediately shows this error and warning in rstudio console/logs (not in app UI):

Error in UseMethod("st_geometry") : 
  no applicable method for 'st_geometry' applied to an object of class "c('SpatialPolygonsDataFrame', 'SpatialPolygons', 'Spatial')"

Warning: sf layer has inconsistent datum (+proj=longlat +datum=NAD83 +no_defs).
Need '+proj=longlat +datum=WGS84'

Seems like the error could happen only within server's reactive called orig_leaf_map reactive or within reactive called data_up_shp. BUT, the problem is not obvious in either one. Unclear where it happens.
The error happens when sf::st_geometry() is called, but that function is called indirectly many times through other sf functions, so it is hard to pin down where the problem happens... sf::st_is_empty and sf::st_geometry_type both use st_geometry. The server uses st_geometry_type() directly, and sf::st_geometry() also happens directly -- and indirectly via sf::st_is_empty() -- within shapefix() which is called by shapefile_from_any() which is called by server's reactive called data_up_shp.