[sidepelican]

Problem

When a protocol is used as a parameter, jextract generates a wrapper class in Swift. The name is based on the enclosing type, method name, and parameter name.

Overloads with the same protocol parameter can therefore generate duplicate wrapper classes:

// Original
public protocol Store {
  func value() -> Int64
}

public struct Client {
  public init(store: some Store) {}
  public init(store: some Store, extra: Int64) {}
}

// Generated
final class _Client_init_store_Wrapper: SwiftJavaStoreWrapper {
  ...
}

final class _Client_init_store_Wrapper: SwiftJavaStoreWrapper {
  ...
}
// ❌ Duplicate wrapper class

Solution

Generate the wrapper class name from the protocol types and reuse the class with the same protocol composition.

fileprivate final class _Java_Store_Box: SwiftJavaStoreWrapper {
  ...
}

The generated class is fileprivate and emitted once per Swift file, so different files can use the same wrapper name without conflicting.

This also adds support for protocol values within tuple parameters.

Fixes #946