Nothing
##"empty features are allowed", {
geo <- '{"type":"FeatureCollection","features":[]}'
sf <- geojsonsf::geojson_sf( geo )
expect_true( nrow(sf) == 0)
expect_true( "sfc_GEOMETRY" %in% attr( sf$geometry , "class" ) )
## round-trip
geo2 <- geojsonsf::sf_geojson( sf, simplify = FALSE )
expect_equal( geo, as.character( geo2 ) )
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