json: cannot unmarshal bool into Go value of type string

[JohnGB]

I have a Go app running on AppEngine which was deployed over 3 months ago.  About 12 hours ago (without anything on the code changing) I started receiving a flood of the following errors:  

JSON failed to decode Google Play token claims (json: cannot unmarshal bool into Go value of type string).

As nothing on the app has changed, I'm fairly stumped as to what could suddenly be causing the errors.  I'd really appreciate any push in the right direction here. 

[Peter Bourgon]

Could the Google Play token API have changed its response structure?

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[John Beckett]

That seems to be the case.  We were expecting a string value (which it used to be), and it seems Google changed it to a bool value.

I'm somewhat surprised by this though, as changing the response structure without letting people know isn't something I would have expected from Google.