Fix/fix development error with react strict mode #32
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Hello.
This fixes a bug that happens when using
react-hook-form
withdefaultValues
option.https://beta.reactjs.org/learn/synchronizing-with-effects#how-to-handle-the-effect-firing-twice-in-development
It basically makes sure it only runs once using the good old _mounted ref.
Should fix: #18
I also added a test.