[heycam/webidl] Integer type conversions seem to return wrong type for unsigned types and long long (#579)

The integer type conversion for [unsigned short](https://heycam.github.io/webidl/#es-unsigned-short), [unsigned long](https://heycam.github.io/webidl/#es-unsigned-long), [long long](https://heycam.github.io/webidl/#es-long-long) and [unsigned long long](https://heycam.github.io/webidl/#es-unsigned-long-long) seem wrong in that they return a value of the wrong type.

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https://github.com/heycam/webidl/issues/579