[PyQt] PyQt 5.5 gives TypeError: invalid result type from model.roleNames()

[Nenad Ognjanovic]

Hello,
I've tried out the latest snapshots of PyQt and SIP with Qt 5.5.0, and
I've been getting the following error that didn't happen in previous
versions:

TypeError: invalid result type from my_model.roleNames()

I've extracted the minimal example that reproduces the problem, I've
attached it to this email and as a gist here:
https://gist.github.com/bgr/0fd25c6808260e0b5d0a

Is this a bug or are we now expected to wrap the dict into some kind
of JSValue wrapper or similar?
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