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event.currentTarget is null #61

Description

@aaronbeall

When handling the onChange event the currentTarget is null.

You can see an example on webpackbin here:

<DebounceInput
  minLength={2}
  debounceTimeout={300}
  onChange={event => {
    console.log("target =", event.target);
    console.log("target.value =", event.target.value);
    console.log("currentTarget =", event.currentTarget);
   }} />

Which gives you the following output after typing "test":

target = <input type=​"text" value data-reactid=​".0.0">​
target.value = test
currentTarget = null

I take it this is because the event is stored then re-dispatched later, and React nulls out the currentTarget after the initial dispatch. However this is not what I would expect because its not how the event argument normally works, you expect currentTarget to be the target you added the handler to.

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