Duplicate executable file in ios *.app folder

[ZhaoXiangXML]

I'm testing my rust project with dinghy 0.6.0 on iOS and I think there's a duplicate executable file:

$ du -sh *
 13M    Dinghy
4.0K    Info.plist
 24K    _CodeSignature
 13M    _dinghy_integration_test-7f308ac5ede5006c
 88M    assets
  0B    test_data
4.0K    tests

It appears that Dinghy and _dinghy_integration_test-7f308ac5ede5006c are the same exe file?

Is it necessary to keep _dinghy_integration_test-7f308ac5ede5006c here? it could slow down installing the app to device.