Request for a way to hook onComposition of DataSearch component

[rubyu]

Is your feature request related to a problem? Please describe.

There are certain people uses IME for input text (e.g. most of Chinese, Japanese). When we treat the case, simply watching a input's value is not enough. We have to use onComposition for treating this.

Describe the solution you'd like

Please see this implementation. I would like to implement this with reactivesearch.
facebook/react#3926 (comment)

The same was reported before, but closed by the reporter.
#1492