A version of Publishers.CombineLatest4 that takes an unlimited number of publishers in an array

Publishers+CombineLatestMany.swift

import Combine 

extension Publishers {
    
    static func CombineLatestMany<Output>(_ pubs: [AnyPublisher<Output, Never>]) -> AnyPublisher<[Output], Never> {
        guard let firstPublisher = pubs.first else {
            return Empty<[Output], Never>(completeImmediately: false).eraseToAnyPublisher()
        }
        
        let allButFirst = Array(pubs.dropFirst())
        
        let firstInArray = firstPublisher.map{ [$0] }.eraseToAnyPublisher()
        let combined = allButFirst.reduce(firstInArray) { partialResult, next in
            partialResult
                .combineLatest(next)
                .map({ resultSoFar, new in
                    return resultSoFar + [new]
                })
                .eraseToAnyPublisher()
        }
        return combined
    }
}