Bump to v4.0.0.

internal/baseToPath.js

@@ -0,0 +1,16 @@
+import isArray from '../isArray';
+import stringToPath from './stringToPath';
+
+/**
+ * The base implementation of `_.toPath` which only converts `value` to a
+ * path if it's not one.
+ *
+ * @private
+ * @param {*} value The value to process.
+ * @returns {Array} Returns the property path array.
+ */
+function baseToPath(value) {
+  return isArray(value) ? value : stringToPath(value);
+}
+
+export default baseToPath;