fix(onChange): specify event may triggered with null

[chalkpe]

onChange is triggered with null sometimes, but type of value is just ValueType (string | number) for now.
However making this change is likely going to be a breaking change; it's more confusing null is given without any notice.

references

• input-number/src/InputNumber.tsx

  Line 294 in 7440f52

  // We just trigger onChange(null)

• fix(onChange): should trigger onChange when removing value #316

...
expect(onChange).toHaveBeenCalledWith(null);
...

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