Bump to v4.17.1.

_castPath.js

@@ -1,15 +1,21 @@
 var isArray = require('./isArray'),
-    stringToPath = require('./_stringToPath');
+    isKey = require('./_isKey'),
+    stringToPath = require('./_stringToPath'),
+    toString = require('./toString');
 
 /**
  * Casts `value` to a path array if it's not one.
  *
  * @private
  * @param {*} value The value to inspect.
+ * @param {Object} [object] The object to query keys on.
  * @returns {Array} Returns the cast property path array.
  */
-function castPath(value) {
-  return isArray(value) ? value : stringToPath(value);
+function castPath(value, object) {
+  if (isArray(value)) {
+    return value;
+  }
+  return isKey(value, object) ? [value] : stringToPath(toString(value));
 }
 
 module.exports = castPath;