xml_length() on empty nodeset #404
Description
xml_length(xml_nodeset()) returns 0 but I feel this should rather be integer() which would also be consistent with e.g. xml_name().
library(xml2)
(ns1 <- xml2:::xml_nodeset())
#> {xml_nodeset (0)}
xml_length(ns1)
#> [1] 0
(ns2 <- xml2:::xml_nodeset(list(xml_missing()), deduplicate = FALSE))
#> {xml_nodeset (1)}
#> [1] <NA>
xml_length(ns2)
#> [1] 0Created on 2023-08-29 with reprex v2.0.2