It's missing query string parsing from new URLs, but you can set the
query string programmatically, and it will be part of the URL when
serialized through to_string().
This was a workaround to be able to build on case-insensitive file
systems where it might get confused about <string.h> vs <String.h>.
Let's just not support building that way, so String.h can have an
objectively nicer name. :^)
