diff --git a/mainNotebook.ipynb b/mainNotebook.ipynb
index 0803187..08aad86 100644
--- a/mainNotebook.ipynb
+++ b/mainNotebook.ipynb
@@ -22,8 +22,8 @@
   {
    "metadata": {
     "ExecuteTime": {
-     "end_time": "2025-01-09T19:14:34.034594Z",
-     "start_time": "2025-01-09T19:14:33.213046Z"
+     "end_time": "2025-01-09T19:18:27.125280Z",
+     "start_time": "2025-01-09T19:18:26.276503Z"
     }
    },
    "cell_type": "code",
@@ -50,21 +50,19 @@
      ]
     }
    ],
-   "execution_count": 2
+   "execution_count": 1
   },
   {
    "metadata": {
     "ExecuteTime": {
-     "end_time": "2025-01-09T19:14:36.741813Z",
-     "start_time": "2025-01-09T19:14:36.645384Z"
+     "end_time": "2025-01-09T19:18:29.388162Z",
+     "start_time": "2025-01-09T19:18:29.329029Z"
     }
    },
    "cell_type": "code",
    "source": [
     "\n",
-    "println(people[2].is_active) //-> Compilation error \"Unresolved reference: is_active\"\n",
-    "println(people[2][\"is_active\"])\n",
-    "println(people[2][\"has_subscription\"])"
+    "println(people[2].is_active) //-> java.lang.ClassCastException: class java.lang.Integer cannot be cast to class java.lang.Boolean (java.lang.Integer and java.lang.Boolean are in module java.base of loader 'bootstrap')\n"
    ],
    "outputs": [
     {
@@ -73,8 +71,8 @@
      "output_type": "error",
      "traceback": [
       "java.lang.ClassCastException: class java.lang.Integer cannot be cast to class java.lang.Boolean (java.lang.Integer and java.lang.Boolean are in module java.base of loader 'bootstrap')",
-      "\tat Line_9_jupyter._DataFrameType_is_active(Line_9.jupyter.kts:7) at Cell In[0], line 7",
-      "\tat Line_11_jupyter.<init>(Line_11.jupyter.kts:2) at Cell In[3], line 2",
+      "\tat Line_6_jupyter._DataFrameType_is_active(Line_6.jupyter.kts:7) at Cell In[0], line 7",
+      "\tat Line_8_jupyter.<init>(Line_8.jupyter.kts:2) at Cell In[2], line 2",
       "\tat java.base/jdk.internal.reflect.DirectConstructorHandleAccessor.newInstance(DirectConstructorHandleAccessor.java:62)",
       "\tat java.base/java.lang.reflect.Constructor.newInstanceWithCaller(Constructor.java:502)",
       "\tat java.base/java.lang.reflect.Constructor.newInstance(Constructor.java:486)",
@@ -133,7 +131,128 @@
      ]
     }
    ],
+   "execution_count": 2
+  },
+  {
+   "metadata": {
+    "ExecuteTime": {
+     "end_time": "2025-01-09T19:19:09.303717Z",
+     "start_time": "2025-01-09T19:19:09.261190Z"
+    }
+   },
+   "cell_type": "code",
+   "source": [
+    "println(people[2].has_subscription) //-> java.lang.ClassCastException: class java.lang.Integer cannot be cast to class java.lang.Boolean (java.lang.Integer and java.lang.Boolean are in module java.base of loader 'bootstrap')\n",
+    "\n"
+   ],
+   "outputs": [
+    {
+     "ename": "java.lang.ClassCastException",
+     "evalue": "class java.lang.Integer cannot be cast to class java.lang.Boolean (java.lang.Integer and java.lang.Boolean are in module java.base of loader 'bootstrap')",
+     "output_type": "error",
+     "traceback": [
+      "java.lang.ClassCastException: class java.lang.Integer cannot be cast to class java.lang.Boolean (java.lang.Integer and java.lang.Boolean are in module java.base of loader 'bootstrap')",
+      "\tat Line_6_jupyter._DataFrameType_has_subscription(Line_6.jupyter.kts:5) at Cell In[0], line 5",
+      "\tat Line_11_jupyter.<init>(Line_11.jupyter.kts:1) at Cell In[5], line 1",
+      "\tat java.base/jdk.internal.reflect.DirectConstructorHandleAccessor.newInstance(DirectConstructorHandleAccessor.java:62)",
+      "\tat java.base/java.lang.reflect.Constructor.newInstanceWithCaller(Constructor.java:502)",
+      "\tat java.base/java.lang.reflect.Constructor.newInstance(Constructor.java:486)",
+      "\tat kotlin.script.experimental.jvm.BasicJvmScriptEvaluator.evalWithConfigAndOtherScriptsResults(BasicJvmScriptEvaluator.kt:122)",
+      "\tat kotlin.script.experimental.jvm.BasicJvmScriptEvaluator.invoke$suspendImpl(BasicJvmScriptEvaluator.kt:48)",
+      "\tat kotlin.script.experimental.jvm.BasicJvmScriptEvaluator.invoke(BasicJvmScriptEvaluator.kt)",
+      "\tat kotlin.script.experimental.jvm.BasicJvmReplEvaluator.eval(BasicJvmReplEvaluator.kt:49)",
+      "\tat org.jetbrains.kotlinx.jupyter.repl.impl.InternalEvaluatorImpl$eval$resultWithDiagnostics$1.invokeSuspend(InternalEvaluatorImpl.kt:137)",
+      "\tat kotlin.coroutines.jvm.internal.BaseContinuationImpl.resumeWith(ContinuationImpl.kt:33)",
+      "\tat kotlinx.coroutines.DispatchedTask.run(DispatchedTask.kt:104)",
+      "\tat kotlinx.coroutines.EventLoopImplBase.processNextEvent(EventLoop.common.kt:277)",
+      "\tat kotlinx.coroutines.BlockingCoroutine.joinBlocking(Builders.kt:95)",
+      "\tat kotlinx.coroutines.BuildersKt__BuildersKt.runBlocking(Builders.kt:69)",
+      "\tat kotlinx.coroutines.BuildersKt.runBlocking(Unknown Source)",
+      "\tat kotlinx.coroutines.BuildersKt__BuildersKt.runBlocking$default(Builders.kt:48)",
+      "\tat kotlinx.coroutines.BuildersKt.runBlocking$default(Unknown Source)",
+      "\tat org.jetbrains.kotlinx.jupyter.repl.impl.InternalEvaluatorImpl.eval(InternalEvaluatorImpl.kt:137)",
+      "\tat org.jetbrains.kotlinx.jupyter.repl.impl.CellExecutorImpl$execute$1$result$1.invoke(CellExecutorImpl.kt:80)",
+      "\tat org.jetbrains.kotlinx.jupyter.repl.impl.CellExecutorImpl$execute$1$result$1.invoke(CellExecutorImpl.kt:78)",
+      "\tat org.jetbrains.kotlinx.jupyter.repl.impl.ReplForJupyterImpl.withHost(ReplForJupyterImpl.kt:774)",
+      "\tat org.jetbrains.kotlinx.jupyter.repl.impl.CellExecutorImpl.execute-L4Nmkdk(CellExecutorImpl.kt:78)",
+      "\tat org.jetbrains.kotlinx.jupyter.repl.execution.CellExecutor$DefaultImpls.execute-L4Nmkdk$default(CellExecutor.kt:13)",
+      "\tat org.jetbrains.kotlinx.jupyter.repl.impl.ReplForJupyterImpl.evaluateUserCode-wNURfNM(ReplForJupyterImpl.kt:596)",
+      "\tat org.jetbrains.kotlinx.jupyter.repl.impl.ReplForJupyterImpl.evalExImpl(ReplForJupyterImpl.kt:454)",
+      "\tat org.jetbrains.kotlinx.jupyter.repl.impl.ReplForJupyterImpl.access$evalExImpl(ReplForJupyterImpl.kt:141)",
+      "\tat org.jetbrains.kotlinx.jupyter.repl.impl.ReplForJupyterImpl$evalEx$1.invoke(ReplForJupyterImpl.kt:447)",
+      "\tat org.jetbrains.kotlinx.jupyter.repl.impl.ReplForJupyterImpl$evalEx$1.invoke(ReplForJupyterImpl.kt:446)",
+      "\tat org.jetbrains.kotlinx.jupyter.repl.impl.ReplForJupyterImpl.withEvalContext(ReplForJupyterImpl.kt:427)",
+      "\tat org.jetbrains.kotlinx.jupyter.repl.impl.ReplForJupyterImpl.evalEx(ReplForJupyterImpl.kt:446)",
+      "\tat org.jetbrains.kotlinx.jupyter.messaging.IdeCompatibleMessageRequestProcessor$processExecuteRequest$1$response$1$1.invoke(IdeCompatibleMessageRequestProcessor.kt:171)",
+      "\tat org.jetbrains.kotlinx.jupyter.messaging.IdeCompatibleMessageRequestProcessor$processExecuteRequest$1$response$1$1.invoke(IdeCompatibleMessageRequestProcessor.kt:170)",
+      "\tat org.jetbrains.kotlinx.jupyter.streams.BlockingSubstitutionEngine.withDataSubstitution(SubstitutionEngine.kt:70)",
+      "\tat org.jetbrains.kotlinx.jupyter.streams.StreamSubstitutionManager.withSubstitutedStreams(StreamSubstitutionManager.kt:118)",
+      "\tat org.jetbrains.kotlinx.jupyter.messaging.IdeCompatibleMessageRequestProcessor.withForkedIn(IdeCompatibleMessageRequestProcessor.kt:347)",
+      "\tat org.jetbrains.kotlinx.jupyter.messaging.IdeCompatibleMessageRequestProcessor.access$withForkedIn(IdeCompatibleMessageRequestProcessor.kt:67)",
+      "\tat org.jetbrains.kotlinx.jupyter.messaging.IdeCompatibleMessageRequestProcessor$evalWithIO$1$1.invoke(IdeCompatibleMessageRequestProcessor.kt:361)",
+      "\tat org.jetbrains.kotlinx.jupyter.streams.BlockingSubstitutionEngine.withDataSubstitution(SubstitutionEngine.kt:70)",
+      "\tat org.jetbrains.kotlinx.jupyter.streams.StreamSubstitutionManager.withSubstitutedStreams(StreamSubstitutionManager.kt:118)",
+      "\tat org.jetbrains.kotlinx.jupyter.messaging.IdeCompatibleMessageRequestProcessor.withForkedErr(IdeCompatibleMessageRequestProcessor.kt:336)",
+      "\tat org.jetbrains.kotlinx.jupyter.messaging.IdeCompatibleMessageRequestProcessor.access$withForkedErr(IdeCompatibleMessageRequestProcessor.kt:67)",
+      "\tat org.jetbrains.kotlinx.jupyter.messaging.IdeCompatibleMessageRequestProcessor$evalWithIO$1.invoke(IdeCompatibleMessageRequestProcessor.kt:360)",
+      "\tat org.jetbrains.kotlinx.jupyter.streams.BlockingSubstitutionEngine.withDataSubstitution(SubstitutionEngine.kt:70)",
+      "\tat org.jetbrains.kotlinx.jupyter.streams.StreamSubstitutionManager.withSubstitutedStreams(StreamSubstitutionManager.kt:118)",
+      "\tat org.jetbrains.kotlinx.jupyter.messaging.IdeCompatibleMessageRequestProcessor.withForkedOut(IdeCompatibleMessageRequestProcessor.kt:328)",
+      "\tat org.jetbrains.kotlinx.jupyter.messaging.IdeCompatibleMessageRequestProcessor.evalWithIO(IdeCompatibleMessageRequestProcessor.kt:359)",
+      "\tat org.jetbrains.kotlinx.jupyter.messaging.IdeCompatibleMessageRequestProcessor$processExecuteRequest$1$response$1.invoke(IdeCompatibleMessageRequestProcessor.kt:170)",
+      "\tat org.jetbrains.kotlinx.jupyter.messaging.IdeCompatibleMessageRequestProcessor$processExecuteRequest$1$response$1.invoke(IdeCompatibleMessageRequestProcessor.kt:169)",
+      "\tat org.jetbrains.kotlinx.jupyter.execution.JupyterExecutorImpl$Task.execute(JupyterExecutorImpl.kt:41)",
+      "\tat org.jetbrains.kotlinx.jupyter.execution.JupyterExecutorImpl$executorThread$1.invoke(JupyterExecutorImpl.kt:81)",
+      "\tat org.jetbrains.kotlinx.jupyter.execution.JupyterExecutorImpl$executorThread$1.invoke(JupyterExecutorImpl.kt:79)",
+      "\tat kotlin.concurrent.ThreadsKt$thread$thread$1.run(Thread.kt:30)",
+      "",
+      "java.lang.ClassCastException: class java.lang.Integer cannot be cast to class java.lang.Boolean (java.lang.Integer and java.lang.Boolean are in module java.base of loader 'bootstrap')",
+      "at Cell In[0], line 5",
+      ""
+     ]
+    }
+   ],
+   "execution_count": 5
+  },
+  {
+   "metadata": {
+    "ExecuteTime": {
+     "end_time": "2025-01-09T19:18:31.416806Z",
+     "start_time": "2025-01-09T19:18:31.368225Z"
+    }
+   },
+   "cell_type": "code",
+   "source": "println(people[2][\"is_active\"])\n",
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "1\n"
+     ]
+    }
+   ],
    "execution_count": 3
+  },
+  {
+   "metadata": {
+    "ExecuteTime": {
+     "end_time": "2025-01-09T19:18:34.223705Z",
+     "start_time": "2025-01-09T19:18:34.179292Z"
+    }
+   },
+   "cell_type": "code",
+   "source": "println(people[2][\"has_subscription\"])",
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "0\n"
+     ]
+    }
+   ],
+   "execution_count": 4
   }
  ],
  "metadata": {