Function to weakify an instance function for safer passage to closures that would otherwise create a retain cycle.

Weakify.swift

@inlinable
public func weakify<Target, Output, each Argument>(
    _ closureProvider: @escaping (Target) -> (repeat each Argument) -> Output,
    on target: Target,
    default: @autoclosure @escaping () -> Output
) -> (repeat each Argument) -> Output where Target: AnyObject {
    { [weak target] (arguments: repeat each Argument) in
        guard let target else {
            return `default`()
        }
        
        return closureProvider(target)(repeat each arguments)
    }
}