SortableContext and ArrayMove could accept ReadonlyArray

[geoffreytools]

Hi,

At current it is more difficult than it should to use ReadonlyArray. I spotted two places where the function signatures could change.

In SortableContext.tsx

export interface Props {
  children: React.ReactNode;
- items: (UniqueIdentifier | {id: UniqueIdentifier})[];
+ items: ReadonlyArray<UniqueIdentifier | {id: UniqueIdentifier}>;
  strategy?: SortingStrategy;
  id?: string;
  disabled?: boolean | Disabled;
}

In arrayMove.ts

- export function arrayMove<T>(array: T[], from: number, to: number): T[] {
+ export function arrayMove<T>(array: readonly T[], from: number, to: number): T[] {