in the current implementation, it is assumed that useEventCallback will receive a react synthetic event. Is there any reason behind this assumption?

this does not let me use the callback on my custom event handlers.

For instance:

const MyInput = ({ onChange, value }) => ( <input onChange={e => onChange(e.target.value)} value={value} /> )

I can't use useEventCallback on MyInput because the type signature of onChange there is:

type onChange = (val: string) => void