message: fix(hub): expose internals
diff: @@ -52,7 +52,7 @@ export interface XHub<RA, RB, EA, EB, A, B> {
  readonly [PR._B]: () => B
  }
  -abstract class XHubInternal<RA, RB, EA, EB, A, B>
  +export abstract class XHubInternal<RA, RB, EA, EB, A, B>
  implements XHub<RA, RB, EA, EB, A, B> {
  readonly typeId: typeof HubTypeId = HubTypeId;
  @@ -111,7 +111,7 @@ abstract class XHubInternal<RA, RB, EA, EB, A, B>
  /**
  * @optimize remove
  */
  -function concrete<RA, RB, EA, EB, A, B>(
  +export function concrete<RA, RB, EA, EB, A, B>(
  _: XHub<RA, RB, EA, EB, A, B>
  ): asserts _ is XHubInternal<RA, RB, EA, EB, A, B> {
  //
  