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use Dancer2;
set serializer => 'Mutable';
...
    return { id => $id, name => 'frank' };
}
dance;

 {"id" => 1,"name" => "frank"} did not pass type constraint "Value" (i
+n $self->{"content"})
    "Value" is defined as: (defined($_) and not ref($_)) in /usr/local
+/share/perl5/Dancer2/Core/App.pm l. 1473