chore(types/merge): fix return type for merge with 5, 6 args

ReactiveX / IxJS

The Interactive Extensions for JavaScript

https://reactivex.io/IxJS/

MIT License

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Closed dgadelha closed 11 months ago

dgadelha commented 1 year ago

Description: Fixes return type for merge with 5 or 6 generic types, matching the other cases.

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