3395876-Implement the whereStrict method for Collection class

Closes #3395877

src/Collection.php

@@ -74,4 +74,22 @@ class Collection extends BaseCollection {
     };
   }
 
+  /**
+   * Filter items using strict comparison.
+   *
+   * @param string $key
+   * @param mixed $value
+   * @return \Drupal\fluent\Collection
+   */
+  public function whereStrict($key, $value)
+  {
+    return $this->filter(function ($item) use ($key, $value) {
+      if ($item instanceof ContentEntityInterface) {
+        return using($item)->value($key) === $value;
+      } else {
+        return data_get($item, $key) === $value;
+      }
+    });
+  }
+
 }