diff --git a/src/Views/ArrayView.php b/src/Views/ArrayView.php
index b5acdc4..0cac457 100644
--- a/src/Views/ArrayView.php
+++ b/src/Views/ArrayView.php
@@ -525,7 +525,13 @@ protected function convertIndex(int $i): int
      */
     private function numericOffsetExists($offset): bool
     {
-        if (!\is_string($offset) && \is_numeric($offset) && (\is_nan($offset) || \is_infinite($offset))) {
+        // Non-string must be integer
+        if (!\is_string($offset) && !\is_int($offset)) {
+            return false;
+        }
+
+        // Numeric string must be 'integer'
+        if (\is_string($offset) && \preg_match('/^-?\d+$/', $offset) !== 1) {
             return false;
         }
 
diff --git a/tests/unit/ArrayView/IndexTest.php b/tests/unit/ArrayView/IndexTest.php
index 410873a..6f77c08 100644
--- a/tests/unit/ArrayView/IndexTest.php
+++ b/tests/unit/ArrayView/IndexTest.php
@@ -287,7 +287,7 @@ public static function dataProviderForIndexesSmallerThanThanNegativeThree(): arr
      * @param mixed $i
      * @return void
      */
-    public function testNonIntegerIndexError($i): void
+    public function testNonIntegerKeyError($i): void
     {
         // Given
         $array = [10, 20, 30];
@@ -312,4 +312,37 @@ public static function dataProviderForNonIntegerIndexes(): array
             ['six'],
         ];
     }
+
+    /**
+     * @dataProvider dataProviderForFloatIndexes
+     * @param mixed $i
+     * @return void
+     */
+    public function testNonIntegerIndexError($i): void
+    {
+        // Given
+        $array = [10, 20, 30];
+        $arrayView = ArrayView::toView($array);
+
+        // Then
+        $this->expectException(IndexError::class);
+
+        // When
+        $number = $arrayView[$i];
+    }
+
+    public static function dataProviderForFloatIndexes(): array
+    {
+        return [
+            [0.1],
+            ['0.5'],
+            ['1.5'],
+            [2.0],
+            [3.1],
+            ['45.66'],
+            [\NAN],
+            [\INF],
+            [-\INF],
+        ];
+    }
 }