The previous behavior was that you had to specify a URL like /some_tool/main.html with a leading slash, so that it would be treated as an absolute URL, or else it would be resolved relative to modloader's index.html. Now URLs are really resolved as if they were literally written in package.json, thus specifying some_tool/main.html is possible. This is not a breaking change because only two people remember about this feature the previous working method of specifying the overridden URL continues to work.
The previous behavior was that you had to specify a URL like
/some_tool/main.htmlwith a leading slash, so that it would be treated as an absolute URL, or else it would be resolved relative to modloader'sindex.html. Now URLs are really resolved as if they were literally written inpackage.json, thus specifyingsome_tool/main.htmlis possible. This is not a breaking change becauseonly two people remember about this featurethe previous working method of specifying the overridden URL continues to work.