added unit testing, and started implementing unit tests...phew

node_modules/@sinonjs/samsam/lib/is-object.js

@@ -0,0 +1,24 @@
+"use strict";
+
+// Returns true when the value is a regular Object and not a specialized Object
+//
+// This helps speeding up deepEqual cyclic checks
+// The premise is that only Objects are stored in the visited array.
+// So if this function returns false, we don't have to do the
+// expensive operation of searching for the value in the the array of already
+// visited objects
+function isObject(value) {
+    return (
+        typeof value === "object" &&
+        value !== null &&
+        // none of these are collection objects, so we can return false
+        !(value instanceof Boolean) &&
+        !(value instanceof Date) &&
+        !(value instanceof Error) &&
+        !(value instanceof Number) &&
+        !(value instanceof RegExp) &&
+        !(value instanceof String)
+    );
+}
+
+module.exports = isObject;