Under the hood
REPL session/turn wiring code was renumbered internally with no behavior change found
What
A large block of internal caching slots used by the React compiler in the REPL's session hook was renumbered, and some local variable names were swapped around. The same underlying session, turn, and notification objects - including idle-notification thresholds - are still wired up the same way.
Why
This is an internal code reshuffle with no found effect on behavior.