Make a type `Identifiable` based on its `Hashable` hash value.

IdentifiableByHashable.swift

/**
Make a type `Identifiable` based on its `Hashable` hash value.

This can be useful when all the properties are required to represent its identifier.

```
struct Item: Hashable, IdentifiableByHashable {
	let title: String
	var message: String?
}
```
*/
public protocol IdentifiableByHashable: Identifiable {}

extension IdentifiableByHashable where Self: Hashable {
	public var id: Int { hashValue }
}