The remappable parameter is not documented, Although I found it in an example, but not in all examples.
I was cleaning up my custom widget definitions here Overriding links with captions - #6 by TW_Tones and removed this parameter and had to edit the html file to fix. It seemed to result in infinite transclusions.
Any clues or guidance I / we can update the documentation, or see if we can protect it from this failure eg check the default is correct.