sqlite3rbu_vacuum("test.db", NULL); fails with an "invalid uri authority" error for local files on Windows because

https://www.sqlite.org/src/file?ci=trunk&name=ext/rbu/sqlite3rbu.c&ln=2786

always generates a zState URI with just 2 slashes like

• file://C:\dir\file.db

According to https://en.wikipedia.org/wiki/File_URI_scheme#Windows_2 URIs for local files should omit the hostname "localhost" but not the slash, like this:

• file:///C:\dir\file.db ^

The latter is then again accepted by sqlite3ParseUri().