chore: Resolve issues downstream at Google

[benlesh]

Unfortunately I don't remember what this resolved, I think there was an issue with TypeScript compilation in Google's more strict environment.

[kolodny]

Note, this also needs to be done for

• src/internal/util/ArgumentOutOfRangeError.ts
• src/internal/util/ObjectUnsubscribedError.ts
• src/internal/util/UnsubscriptionError.ts
• src/internal/util/TimeoutError.ts
• src/internal/util/EmptyError.ts

[benlesh]

Closed in favor of #4978