[PyQt] Empty string converted to 0.0 using pyqtSlot

[Kálmán Viktor]

Hello,

this code produces the following output

Python snippet
@pyqtSlot(float)
def xy(self, amount):
    print("am", amount)

QML snippet
print(amountInput.text, amountInput.text === "")
controller.xy(amountInput.text)

Output
qml:  true
am 0.0

Is this intentional? If I use any other string than "" I get (I think the
correct) nan. I'm using PyQt5==5.11.2
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