Summary & Key Takeaways ​

• Internal runtime seams are moved off the solid-js surface to solid-js/internal for better encapsulation.
• merge() and omit() now return lazy views, optimizing how props are read leaf by leaf.
• This change improves performance for spread and SSR element rendering by avoiding proxy traps.
• TypeScript declarations no longer expose internal API names, improving developer experience.
• Ensures a single reactive engine guarantee remains untouched at runtime.

Our Commentary ​

This is deep in the SolidJS internals, but it's the kind of work that pays off in performance. Moving internal APIs behind a subpath is just good hygiene. I appreciate the focus on lazy views for props; it's a subtle change that can have a real impact on rendering speed, especially in complex component trees.