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is this a compiler bug (1.3.72)?  The objects in the map are the right type but it wants the type of the variable to be more defined?

Check your imports. Did you import TypeAdapter from the right place?

java.lang.Class and com.google.gson.TypeAdapter
Right ones AFAIK.

Are you using IntelliJ?
If so try to uncheck in the preferences:
Build, Execution, Deployment :arrow_right: Compiler :arrow_right:Kotlin Compiler:arrow_right: `Enable new type inference algorithm for IDE analysis`
If the error then shows up before compiling, you know that the new type inference would fix the problem.
There is a flag to enable it for compiling

Interesting... This is in Android Studio unfortunately.
I'll see if I can load it in IJ..

In AS the setting is located in "File | Settings | Kotlin Compiler". In any case, please report an issue to <http://kotl.in/issue> with a self-contained code example. Thanks!