ObjC: Imprecise return type generated

[brianquinlan]

This example comes from NSURLSession.h:

@interface NSURLSessionTask : NSObject <NSCopying, NSProgressReporting>

@property (nullable, readonly, copy) NSURLRequest  *originalRequest;  

The generated Dart code is:

  static ffi.Pointer<ObjCSel>? _sel_originalRequest;
  NSObject get originalRequest {
    _sel_originalRequest ??= _registerName(_lib, "originalRequest");
    final _ret = _lib._objc_msgSend_126(_id, _sel_originalRequest!);
    return NSObject._(_ret, _lib);
  }

Note how the return type is NSObject instead of NSURLRequest.