Array change: 2/3 (__stringifyMapKeys)
Array change: 2/3 (__stringifyMapKeys)

Summary: This is a safe change to make!

Reviewed By: prasad223

Differential Revision: D37122035

fbshipit-source-id: fd74431b36ad87d82b575827f2d371598a094699

facebook/fbthrift,facebook/fbthrift,facebook/fbthrift,facebook/fbthrift,facebook/fbthrift,facebook/fbthrift,facebook/fbthrift,facebook/fbthrift,facebook/fbthrift