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The usage of the "superset" expression is very confusing to me and I bet to many others.

I would recommend to use other terms such as "Additive" or "Complementary" to describe JSR.

That's not really what "superset" means, so I think you might want to change the wording.

JSR is almost literally a subset of npm in features. Npm allows publishing of anything, JSR only actual TS/ESM. Whether those modules have dependencies doesn’t expand the set IMHO

> I think this is mostly right - "superset" in that JSR modules can depend on npm modules

This is not what most people would think when a registry is said to be a “superset” of another.