`URIs.splitpath(::String)` unexpected behaviour

```julia
julia> URIs.splitpath(URIs.URI("https://asdf.com/a/b?x=y#z"))
2-element Vector{String}:
 "a"
 "b"

julia> URIs.splitpath("https://asdf.com/a/b?x=y#z")
5-element Vector{String}:
 "https:"
 ""
 "asdf.com"
 "a"
 "b"

```

Based on the documentation for `splitpath`, I expected both to return the same result. 