I would have thought github is the right place to raise this issue but was not sure whether to raise it in mwembed or platform-installation-packages, so putting it here for appropriate inputs.
When installing or upgrading the Kaltura installation, kaltura-html5lib is the largest of the downloaded packages. When I looked into it’s contents, it seems to contain 6 different versions of html5lib.
From whatever little I could trace, it seems only the latest is being used. Are the others there for backward compatibility? Is it possible to drop the non-essential ones?