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Undoing a main edit synced into thousands of copies overflowed the stack, on the JVM and in JS (F84). Each synced shape added the undo of its parents' update to the end of the undo list with a lazy concat, so the list nested one lazy sequence per synced shape, and reading it recursed through all of them. concat-changes and the inverse sync's marking of local changes (a map over the whole list at every level of the walk) added more. - A shape's :reg-objects undo now goes right after the shape's own. Each parent is still updated after all its children are undone, and a synced parent gets back its stored values instead of recomputed ones; the undo round trip of every composable case is unchanged. - concat-changes builds the joined undo list at once, at a cost that grows with the list it adds. - The inverse sync collects the copy shapes it syncs and marks their changes as local once, at the end, instead of at every level. large-sync-undo-test builds 5,000 copies in one step, syncs a main edit into them and reads the undo list. Benchmark (lower quantile, ms; baseline / now / ratio): deepest-edit-through-three-levels 35.2 / 37.3 / 1.06 edit-through-a-chain-of-dependents 68.9 / 69.8 / 1.01 library-update-into-copies 83.1 / 76.7 / 0.92 main-edit-into-10-copies 1.8 / 1.6 / 0.88 main-edit-into-100-copies 15.4 / 15.2 / 0.99 main-edit-into-1000-copies 153.1 / 152.9 / 1.00 variant-switch-into-copies 32.1 / 27.3 / 0.85 (Measured with the dead :shapes-group reads already removed; run side by side, this commit and that state give the same ratios.) AI-assisted-by: claude-opus-5-5