splitting an item must always happen inside a transaction, because we always need to check if we can merge it back

tests/y-array.tests.js

@@ -306,6 +306,8 @@ const arrayTransactions = [
   }
 ]
 
+// TODO: http://127.0.0.1:3443/?filter=\[22/&seed=1943600076
+
 /**
  * @param {t.TestCase} tc
  */

tests/y-map.tests.js

@@ -348,7 +348,7 @@ const mapTransactions = [
  * @param {t.TestCase} tc
  */
 export const testRepeatGeneratingYmapTests10 = tc => {
-  applyRandomTests(tc, mapTransactions, 4)
+  applyRandomTests(tc, mapTransactions, 10)
 }
 
 /**