feat: check whether structs within arrays/slices/maps implement a Marshaler interface

[Adjective-Object]

The current implementation of interface checks only handles cases where the root type implements json.Marshal. If it does not, the type is "unpacked" to a raw struct type, which is then checked for json: tags.

This fails when the root type does not implement json.Unmarshal, but is a transparent container for a type that contains a json.Marshal; e.g. []MyType or map[string]MyType where MyType implements json.Marshal.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 79.45%. Comparing base (a6b60d7) to head (47c706f).

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #87   +/-   ##
=======================================
  Coverage   79.45%   79.45%           
=======================================
  Files           3        3           
  Lines         219      219           
=======================================
  Hits          174      174           
  Misses         32       32           
  Partials       13       13           

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[tmzane]

Thanks!