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zxch3n and others added 4 commits September 30, 2026 03:42
* test(loro.js): add a Rust differential suite for MovableList

Drive the Rust WASM build and loro.js with the same random multi-peer
edits, crossing engines on every sync, and require equal values, versions,
per-element metadata and events. Profiles that diverge on the current
MovableList model are recorded as known divergences. Design and findings:
context/loro-js-movable-list.md.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

* test(loro.js): compare event effects and replicate unordered reverts

Event deltas that differ only in shape are checked by effect; reverts whose
op order Rust leaves to hash order are checked by value and replicated from
Rust; peers that both engines reject are retired; peer IDs are never reused;
undo stays unchained; the minimizer keeps those rules. See
context/loro-js-movable-list.md.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

* test(loro.js): join shallow snapshots through Rust and keep replayed undo unchained

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

* test(loro.js): accept no-op sequence events and replicate reverts whose diff shape differs

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

* test(loro.js): skip shallow editors and start range exports at the shallow root

Both follow Rust issues listed in context/loro-js-movable-list.md.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

* test(loro.js): measure revert container depths at the revert target

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

* test(loro.js): run the MovableList differential suite on the shared Rust reference

Load Rust through tests/support/rust-reference.ts like the other differential
suites, so it runs in `pnpm test` (and in CI's test-loro-js) and skips without
a WASM build. Drop the separate workflow and scripts. insert/delete now
converges on main.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

* test(loro.js): skip final syncs with a peer that left the run

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

* test(loro.js): skip map entries that only delete keys when comparing diff()

A child created in the range whose keys were all set and deleted again is
listed by Rust and omitted by loro.js, also on main and for any parent; see
context/loro-js-movable-list.md.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

* test(loro.js): fix the suite's changeset and ignore empty diff() deltas

The changeset named a test:differential script that does not exist. Rust's
diff() can list a sequence with an empty delta where loro.js omits it
(context/loro-js-movable-list.md).

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

---------

Co-authored-by: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
#1166)

* test(loro.js): add a Rust differential suite for MovableList

Drive the Rust WASM build and loro.js with the same random multi-peer
edits, crossing engines on every sync, and require equal values, versions,
per-element metadata and events. Profiles that diverge on the current
MovableList model are recorded as known divergences. Design and findings:
context/loro-js-movable-list.md.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

* test(loro.js): compare event effects and replicate unordered reverts

Event deltas that differ only in shape are checked by effect; reverts whose
op order Rust leaves to hash order are checked by value and replicated from
Rust; peers that both engines reject are retired; peer IDs are never reused;
undo stays unchained; the minimizer keeps those rules. See
context/loro-js-movable-list.md.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

* test(loro.js): join shallow snapshots through Rust and keep replayed undo unchained

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

* test(loro.js): accept no-op sequence events and replicate reverts whose diff shape differs

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

* test(loro.js): skip shallow editors and start range exports at the shallow root

Both follow Rust issues listed in context/loro-js-movable-list.md.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

* test(loro.js): measure revert container depths at the revert target

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

* test(loro.js): run the MovableList differential suite on the shared Rust reference

Load Rust through tests/support/rust-reference.ts like the other differential
suites, so it runs in `pnpm test` (and in CI's test-loro-js) and skips without
a WASM build. Drop the separate workflow and scripts. insert/delete now
converges on main.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

* fix(loro.js): model MovableList like Rust (positions and LWW elements)

MovableList keeps a Fugue sequence of list items and elements whose
position and value are last-writer-wins registers, as Rust does. Moves of
concurrently deleted elements, deletes after moves, snapshots (list item,
element and last-set IDs, dead items), metadata getters, version
transitions, revertTo/applyDiff (Rust's apply_delta), undo and events now
match Rust. Snapshot-hydrated documents replay history before concurrent
imports, and a few shallow-snapshot incompatibilities are fixed. The
differential suite passes every profile. Design and remaining gaps:
context/loro-js-movable-list.md.

Rebuilt on current main: MovableList joins #1126's per-container snapshot
completion (its snapshot state names Rust IDs), applyDiff/revertTo/undo use
main's port of Rust #1138's apply_delta on the new model, and undo
transforms only over changes the UndoManager did not make.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

* test(loro.js): skip final syncs with a peer that left the run

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

* fix(loro.js): keep pending changes and follow Rust's shallow import rules

Decoding deferred snapshot history dropped pending changes. Shallow imports
now check the unknown part of each change like is_before_shallow_root, and an
import that only adds pending changes creates their root containers.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

* test(loro.js): pin diff() of a MovableList child created in the range

main's diff() reports such a child by its ops, including map keys set and
deleted again, as Rust does.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

* perf(loro.js): resolve concurrent MovableList op indices through a tracker

A causal view per concurrent op made importing concurrent moves O(n^2).
Like Rust's Tracker::checkout, keep a tracker version and a per-position
delta metric that moves incrementally between op versions; see
context/loro-js-movable-list.md.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

* chore(loro.js): describe the merged MovableList fixes in the changeset

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

* fix(loro.js): never walk a container's fields when comparing event values

A MovableList replaced by a plain value made the comparison enumerate the
container and hit its guarded element sequence.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

* test(loro.js): fuzz MovableList in the multi-peer differential CI run

The Rust-model MovableList passes seeds 0-599 of the #1141 fuzz with all
oracles in lockstep with Rust; main failed 144 of seeds 0-299.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

* fix(loro.js): apply MovableList diffs deletes first, like Rust's apply_delta

Without moved children the delta was walked in order, which gave the ops
other IDs than Rust's and later deletes by ID missed.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

* test(loro.js): skip map entries that only delete keys when comparing diff()

A child created in the range whose keys were all set and deleted again is
listed by Rust and omitted by loro.js, also on main and for any parent; see
context/loro-js-movable-list.md.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

* docs(loro.js): record snapshot completion on import and its cost

The performance context still described main's MovableList snapshot special
case and #1163 as open. Measurements are in context/loro-js-performance.md.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

* perf(loro.js): check MovableList transition inserts in one tree walk

canTransition walked the position tree once per insert op, which made
checkout, diff and revertTo O(insert ops * positions). Collect the runs and
check them in one containsIdRuns call, as the List branch does.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

* test(loro.js): fix the suite's changeset and ignore empty diff() deltas

The changeset named a test:differential script that does not exist. Rust's
diff() can list a sequence with an empty delta where loro.js omits it
(context/loro-js-movable-list.md).

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

---------

Co-authored-by: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
* test(loro.js): add a Rust differential suite for MovableList

Drive the Rust WASM build and loro.js with the same random multi-peer
edits, crossing engines on every sync, and require equal values, versions,
per-element metadata and events. Profiles that diverge on the current
MovableList model are recorded as known divergences. Design and findings:
context/loro-js-movable-list.md.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

* test(loro.js): compare event effects and replicate unordered reverts

Event deltas that differ only in shape are checked by effect; reverts whose
op order Rust leaves to hash order are checked by value and replicated from
Rust; peers that both engines reject are retired; peer IDs are never reused;
undo stays unchained; the minimizer keeps those rules. See
context/loro-js-movable-list.md.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

* test(loro.js): join shallow snapshots through Rust and keep replayed undo unchained

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

* test(loro.js): accept no-op sequence events and replicate reverts whose diff shape differs

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

* test(loro.js): skip shallow editors and start range exports at the shallow root

Both follow Rust issues listed in context/loro-js-movable-list.md.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

* test(loro.js): measure revert container depths at the revert target

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

* test(loro.js): run the MovableList differential suite on the shared Rust reference

Load Rust through tests/support/rust-reference.ts like the other differential
suites, so it runs in `pnpm test` (and in CI's test-loro-js) and skips without
a WASM build. Drop the separate workflow and scripts. insert/delete now
converges on main.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

* fix(loro.js): model MovableList like Rust (positions and LWW elements)

MovableList keeps a Fugue sequence of list items and elements whose
position and value are last-writer-wins registers, as Rust does. Moves of
concurrently deleted elements, deletes after moves, snapshots (list item,
element and last-set IDs, dead items), metadata getters, version
transitions, revertTo/applyDiff (Rust's apply_delta), undo and events now
match Rust. Snapshot-hydrated documents replay history before concurrent
imports, and a few shallow-snapshot incompatibilities are fixed. The
differential suite passes every profile. Design and remaining gaps:
context/loro-js-movable-list.md.

Rebuilt on current main: MovableList joins #1126's per-container snapshot
completion (its snapshot state names Rust IDs), applyDiff/revertTo/undo use
main's port of Rust #1138's apply_delta on the new model, and undo
transforms only over changes the UndoManager did not make.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

* test(loro.js): skip final syncs with a peer that left the run

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

* fix(loro.js): keep pending changes and follow Rust's shallow import rules

Decoding deferred snapshot history dropped pending changes. Shallow imports
now check the unknown part of each change like is_before_shallow_root, and an
import that only adds pending changes creates their root containers.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

* test(loro.js): pin diff() of a MovableList child created in the range

main's diff() reports such a child by its ops, including map keys set and
deleted again, as Rust does.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

* perf(loro.js): resolve concurrent MovableList op indices through a tracker

A causal view per concurrent op made importing concurrent moves O(n^2).
Like Rust's Tracker::checkout, keep a tracker version and a per-position
delta metric that moves incrementally between op versions; see
context/loro-js-movable-list.md.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

* chore(loro.js): describe the merged MovableList fixes in the changeset

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

* fix(loro.js): make import and importBatch atomic

A failed import no longer leaves history, pending changes, version,
containers, state or events half applied. In-place history changes are
journaled and undone, state is rebuilt only when it had changed, events are
emitted after success.
Details: context/import-batch-atomicity.md ("loro.js").

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

* fix(loro.js): never walk a container's fields when comparing event values

A MovableList replaced by a plain value made the comparison enumerate the
container and hit its guarded element sequence.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

* test(loro.js): fuzz MovableList in the multi-peer differential CI run

The Rust-model MovableList passes seeds 0-599 of the #1141 fuzz with all
oracles in lockstep with Rust; main failed 144 of seeds 0-299.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

* fix(loro.js): apply MovableList diffs deletes first, like Rust's apply_delta

Without moved children the delta was walked in order, which gave the ops
other IDs than Rust's and later deletes by ID missed.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

* test(loro.js): skip map entries that only delete keys when comparing diff()

A child created in the range whose keys were all set and deleted again is
listed by Rust and omitted by loro.js, also on main and for any parent; see
context/loro-js-movable-list.md.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

* docs(loro.js): record snapshot completion on import and its cost

The performance context still described main's MovableList snapshot special
case and #1163 as open. Measurements are in context/loro-js-performance.md.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

* perf(loro.js): check MovableList transition inserts in one tree walk

canTransition walked the position tree once per insert op, which made
checkout, diff and revertTo O(insert ops * positions). Collect the runs and
check them in one containsIdRuns call, as the List branch does.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

* test(loro.js): fix the suite's changeset and ignore empty diff() deltas

The changeset named a test:differential script that does not exist. Rust's
diff() can list a sequence with an empty delta where loro.js omits it
(context/loro-js-movable-list.md).

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

* perf(loro.js): journal snapshot-sequence writes instead of copying per import

Each import copied the whole snapshot-sequence table for rollback, so its cost
grew with the number of snapshot-hydrated containers. Record each write in the
import journal instead (context/import-batch-atomicity.md).

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

---------

Co-authored-by: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
…) (#1168)

* test(loro.js): add a Rust differential suite for MovableList

Drive the Rust WASM build and loro.js with the same random multi-peer
edits, crossing engines on every sync, and require equal values, versions,
per-element metadata and events. Profiles that diverge on the current
MovableList model are recorded as known divergences. Design and findings:
context/loro-js-movable-list.md.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

* test(loro.js): compare event effects and replicate unordered reverts

Event deltas that differ only in shape are checked by effect; reverts whose
op order Rust leaves to hash order are checked by value and replicated from
Rust; peers that both engines reject are retired; peer IDs are never reused;
undo stays unchained; the minimizer keeps those rules. See
context/loro-js-movable-list.md.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

* test(loro.js): join shallow snapshots through Rust and keep replayed undo unchained

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

* test(loro.js): accept no-op sequence events and replicate reverts whose diff shape differs

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

* test(loro.js): skip shallow editors and start range exports at the shallow root

Both follow Rust issues listed in context/loro-js-movable-list.md.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

* test(loro.js): measure revert container depths at the revert target

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

* test(loro.js): run the MovableList differential suite on the shared Rust reference

Load Rust through tests/support/rust-reference.ts like the other differential
suites, so it runs in `pnpm test` (and in CI's test-loro-js) and skips without
a WASM build. Drop the separate workflow and scripts. insert/delete now
converges on main.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

* fix(loro.js): model MovableList like Rust (positions and LWW elements)

MovableList keeps a Fugue sequence of list items and elements whose
position and value are last-writer-wins registers, as Rust does. Moves of
concurrently deleted elements, deletes after moves, snapshots (list item,
element and last-set IDs, dead items), metadata getters, version
transitions, revertTo/applyDiff (Rust's apply_delta), undo and events now
match Rust. Snapshot-hydrated documents replay history before concurrent
imports, and a few shallow-snapshot incompatibilities are fixed. The
differential suite passes every profile. Design and remaining gaps:
context/loro-js-movable-list.md.

Rebuilt on current main: MovableList joins #1126's per-container snapshot
completion (its snapshot state names Rust IDs), applyDiff/revertTo/undo use
main's port of Rust #1138's apply_delta on the new model, and undo
transforms only over changes the UndoManager did not make.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

* test(loro.js): skip final syncs with a peer that left the run

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

* fix(loro.js): keep pending changes and follow Rust's shallow import rules

Decoding deferred snapshot history dropped pending changes. Shallow imports
now check the unknown part of each change like is_before_shallow_root, and an
import that only adds pending changes creates their root containers.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

* test(loro.js): pin diff() of a MovableList child created in the range

main's diff() reports such a child by its ops, including map keys set and
deleted again, as Rust does.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

* perf(loro.js): resolve concurrent MovableList op indices through a tracker

A causal view per concurrent op made importing concurrent moves O(n^2).
Like Rust's Tracker::checkout, keep a tracker version and a per-position
delta metric that moves incrementally between op versions; see
context/loro-js-movable-list.md.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

* chore(loro.js): describe the merged MovableList fixes in the changeset

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

* fix(loro.js): make import and importBatch atomic

A failed import no longer leaves history, pending changes, version,
containers, state or events half applied. In-place history changes are
journaled and undone, state is rebuilt only when it had changed, events are
emitted after success.
Details: context/import-batch-atomicity.md ("loro.js").

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

* fix(loro.js): reject MovableList moves and sets of elements outside their history

Port of #1125; see context/loro-js-movable-list.md (Validation).

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

* fix(loro.js): never walk a container's fields when comparing event values

A MovableList replaced by a plain value made the comparison enumerate the
container and hit its guarded element sequence.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

* test(loro.js): fuzz MovableList in the multi-peer differential CI run

The Rust-model MovableList passes seeds 0-599 of the #1141 fuzz with all
oracles in lockstep with Rust; main failed 144 of seeds 0-299.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

* fix(loro.js): apply MovableList diffs deletes first, like Rust's apply_delta

Without moved children the delta was walked in order, which gave the ops
other IDs than Rust's and later deletes by ID missed.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

* test(loro.js): skip map entries that only delete keys when comparing diff()

A child created in the range whose keys were all set and deleted again is
listed by Rust and omitted by loro.js, also on main and for any parent; see
context/loro-js-movable-list.md.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

* docs(loro.js): record snapshot completion on import and its cost

The performance context still described main's MovableList snapshot special
case and #1163 as open. Measurements are in context/loro-js-performance.md.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

* perf(loro.js): check MovableList transition inserts in one tree walk

canTransition walked the position tree once per insert op, which made
checkout, diff and revertTo O(insert ops * positions). Collect the runs and
check them in one containsIdRuns call, as the List branch does.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

* test(loro.js): fix the suite's changeset and ignore empty diff() deltas

The changeset named a test:differential script that does not exist. Rust's
diff() can list a sequence with an empty delta where loro.js omits it
(context/loro-js-movable-list.md).

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

* perf(loro.js): journal snapshot-sequence writes instead of copying per import

Each import copied the whole snapshot-sequence table for rollback, so its cost
grew with the number of snapshot-hydrated containers. Record each write in the
import journal instead (context/import-batch-atomicity.md).

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

---------

Co-authored-by: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
@pull pull Bot locked and limited conversation to collaborators Sep 30, 2026
@pull pull Bot added the ⤵️ pull label Sep 30, 2026
@pull
pull Bot merged commit 6e3e3c0 into Superoldman96:main Sep 30, 2026
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