Unexpected joinpath result

[fonsp]

JavaScript:

> new URL("./style.css", "http://x.org/wow/index.html").href
"http://x.org/wow/style.css"

> new URL("./style.css", "http://x.org/wow/index.html/").href
"http://x.org/wow/index.html/style.css"

URIs master:

julia> joinpath(URI("http://x.org/wow/index.html"), "./style.css")
URI("http://x.org/wow/index.html/style.css")

julia> joinpath(URI("http://x.org/wow/index.html/"), "./style.css")
URI("http://x.org/wow/index.html/style.css")

[fonsp]

@c42f Is this something that we should fix, or do you want to leave the behaviour to prevent a breaking change?