[PyQt] QSignalSpy with bytes broken in PytQt 5.7

[Florian Bruhin]

This works fine and prints b'foo' as expected with PyQt 5.6 and
Qt 5.7:

    from PyQt5.QtTest import QSignalSpy
    from PyQt5.QtCore import QCoreApplication, QObject, pyqtSignal

    class Signaller(QObject):
        sig = pyqtSignal(bytes)

    app = QCoreApplication([])
    signaller = Signaller()
    spy = QSignalSpy(signaller.sig)
    signaller.sig.emit(b'foo')
    print(spy[0][0])

However, with PyQt 5.7 I get None and this warning:

    QSignalSpy: Unable to handle parameter '' of type 'const char*' of
    method 'sig', use qRegisterMetaType to register it.

Florian

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