This gives us more readable output. Both because it gives just a
diff, rather than the whole object as a string, but also as it
captures differences between the objects that thir string
representation does not.
In particular, if a field is an interface I, and T implements I,
then an object of type T and a pointer to the same object can both
be assigned to a variable of type I. Either way, the JSON
representation is the same, but the objects (correctly) do not
compare equal.
This is a pain to debug.
Signed-off-by: Tom Gundersen <teg@jklm.no>
0f2b8e597e