Java2Swift: static native methods

Are static native methods supported?

I have (yes, related to #168) this:

public class SwiftHeapObjectHolder implements AutoCloseable {
...
  public static native void _releaseSwiftObject(long swiftObject);
}

but I don't see anything in the generated Swift file. If I just naively attempt to implement as an extension on JavaClass<SwiftHeapObjectHolder>, I get a load time error – weirdly it's looking for Java_com_padl_FlutterAndroid_SwiftHeapObjectHolder__1releaseSwiftObject. No idea where the 1 prefix came from. If I put that in the Swift method name, it at least loads OK:

@JavaImplementation("com.padl.FlutterAndroid.SwiftHeapObjectHolder")
extension JavaClass<SwiftHeapObjectHolder> {
  @JavaMethod
  public static func _1releaseSwiftObject(swiftObject: Int64, environment: JNIEnvironment? = nil) {
    guard swiftObject != 0 else { return }
    let swiftObjectIntPtr = Int(swiftObject)
    unsafeBitCast(Int(swiftObjectIntPtr), to: Unmanaged<AnyObject>.self).release()
  }
}

Start with the Java declaration and compare it with the generated Swift file, then inspect how native methods are represented for JavaClass extensions. Verify that static native methods are generated and that the resulting Swift implementation loads with the expected native name.