Questioning the functionality of `Effect.fromNullable` and its handling of null values

const intent = yield* $(
    Effect.fromNullable(formData.get('intent')), // FormDataEntryValue | null
    Effect.mapError(() => new NoIntentProvided()),
    Effect.map(a => a) // <---- this is a string | null
);

const intent = yield* $(
    Effect.fromNullable(formData.get('intent')), // FormDataEntryValue | null
    Effect.mapError(() => new NoIntentProvided()),
    Effect.map(a => a) // <---- this is a string | null
);