appcompat-v7 v21.0.0 causing crash on Samsung devices with Android v4.2.2

I found the proper solution here: https://stackoverflow.com/a/26641388/1266123

By using

-keep class !android.support.v7.internal.view.menu.**,android.support.v7.** {*;}

instead of

-keep class android.support.v7.** {*;}

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