Function convertValue

packages/react-stately/src/select/useSelectState.ts:272–280

(value: Key | Key[] | null | undefined)

}

function convertValue(value: Key | Key[] | null | undefined) {
  if (value === undefined) {
    return undefined;
  }
  if (value === null) {
    return [];
  }
  return Array.isArray(value) ? value : [value];
}