Summary:
Because `TextInput` only render the `defaultValue` of `string`, when using other types of values, it will render empty('') without any Warnings.
Closes https://github.com/facebook/react-native/pull/11478
Differential Revision: D4340132
Pulled By: lacker
fbshipit-source-id: aedb96d49277836000c0adc53007c97db6363253