Improve non-standard type encoding #12
                
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This PR improves the JSON encoding of non-standard types by introducing and using the
.defaultsmodule. The.defaultsmodule adds helper functions that can test and apply formatting for types not supported by a given encoder.Please note that in doing so, some outputs of the
JsonFormatterhave changed. That said these changes return more "reasonable" results rather the the originalstr(o)fallback.For more detailed list of changes to the encoders see the CHANGELOG.
Test Plan
Have added additional tests and now check for specific output.