mwg API
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    Interface SaveSystemOptions

    interface SaveSystemOptions {
        migrations?: Record<number, (state: unknown) => unknown>;
        namespace: string;
        storage?: SaveStorage;
        version: number;
    }
    Index
    migrations?: Record<number, (state: unknown) => unknown>

    upgrades state saved at key v to version v + 1; applied in sequence up to version

    namespace: string

    namespaces every slot key, so two games sharing an origin never collide

    storage?: SaveStorage
    version: number