improve memory allocation ⇒ less "minor gc" cleanups

tests/testHelper.js

@@ -330,6 +330,7 @@ export const compareStructStores = (ss1, ss2) => {
         s1.constructor !== s2.constructor ||
         !Y.compareIDs(s1.id, s2.id) ||
         s1.deleted !== s2.deleted ||
+        // @ts-ignore
         s1.length !== s2.length
       ) {
         t.fail('Structs dont match')

tests/y-text.tests.js

@@ -205,6 +205,23 @@ export const testFormattingRemovedInMidText = tc => {
   t.assert(Y.getTypeChildren(text0).length === 3)
 }
 
+/**
+ * @param {t.TestCase} tc
+ *
+export const testLargeFragmentedDocument = tc => {
+  const { text0, text1, testConnector } = init(tc, { users: 2 })
+  // @ts-ignore
+  text0.doc.transact(() => {
+    for (let i = 0; i < 1000000; i++) {
+      text0.insert(0, '0')
+    }
+  })
+  t.measureTime('time to apply', () => {
+    testConnector.flushAllMessages()
+  })
+}
+*/
+
 // RANDOM TESTS
 
 let charCounter = 0