Store __inverseRels__ not cleaned up with transform option { useBuffer: true } #988

We are using

settings.defaultTransformOptions = { useBuffer: true };

as otherwise the performance of indexeddb bulk operations is very very slow.

Unfortunately, with the latest version, we see that the store for keeping track of rels is not touched at all when removing a record.

Example:

// source = indexeddbsource
source.push([
  source.transformBuilder.removeRecord({ id: '123', type: 'test' })
]);

// Result in indexeddb with `useBuffer: true`
// 1. Record '123' is removed from store `test`
// 2. All relationships in store `__inverseRels__` of record '123' are still there

// Result in indexeddb with `useBuffer: false`
// 1. Record '123' is removed from store `test`
// 2. All relationships in store `__inverseRels__` of record '123' are removed

After some digging, I think the AsyncCacheIntegrityProcessor processor creates the transforms that clean up the __inverseRels__ store with useBuffer: false.

With useBuffer: true, it seems to be the job of SyncCacheIntegrityProcessor, but somehow it fails to return the changeset to remove the inverse rels @

const changes = buffer.stopTrackingChanges();

Versions

"@orbit/indexeddb": "0.17.2",
"@orbit/indexeddb-bucket": "0.17.0",
"@orbit/jsonapi": "0.17.1",
"@orbit/records": "0.17.0",
"@orbit/serializers": "0.17.0",