This is a simplified version of my code but I’d like to be able to initialise an NSPredicate from a generic KeyPath<Root, Value> but despite persistent attempts I’ve fallen short. Can anyone help?

PS: I am aware I could alter the method to take a key: String and have callers use #keypath(Object.property) at the call-site but I do not want to do that, as I want to enforce a KeyPath is used for compile safety.

Attempt 1

func makeNSPredicate<Root, Value>(keyPath: KeyPath<Root,Value>, value: Value) {
    NSPredicate(format: "%K == (value)", argumentArray: [keyPath])
}

Runtime error: signal SIGABRT

Attempt 2

func makeNSPredicate<Root, Value>(keyPath: KeyPath<Root,Value>, value: Value) {
    NSPredicate(format: "%K == (value)", keyPath)
}

Compile error: Argument type ‘KeyPath<Root, Value>’ does not conform to expected type ‘CVarArg’

Attempt 3

func makeNSPredicate<Root, Value>(keyPath: KeyPath<Root,Value>, value: Value) {
    NSPredicate(format: "%K == (value)", #keyPath(keyPath))
}

Argument of ‘#keyPath’ refers to non-‘@objc’ property ‘keyPath’