createState method
Implementation
@override
BinderState<T> createState(ObservableLocator locator) =>
BinderState.create<T, T>(
computeState: (locator, currentValue, _) => fn(locator, currentValue),
observeFrom: (computedState) => computedState,
disposeState: null,
pendingValue: null,
catchError: catchError,
equals: equals,
disposeValue: dispose,
locator: locator,
key: key,
);