Move internal modules to “internal” folder.

.internal/getMatchData.js

@@ -0,0 +1,23 @@
+import isStrictComparable from './.internal/isStrictComparable.js';
+import keys from './keys.js';
+
+/**
+ * Gets the property names, values, and compare flags of `object`.
+ *
+ * @private
+ * @param {Object} object The object to query.
+ * @returns {Array} Returns the match data of `object`.
+ */
+function getMatchData(object) {
+  const result = keys(object);
+  let length = result.length;
+
+  while (length--) {
+    const key = result[length];
+    const value = object[key];
+    result[length] = [key, value, isStrictComparable(value)];
+  }
+  return result;
+}
+
+export default getMatchData;