Hi All,

I've created a simple struct that wraps time.Time because I'd like to
unmarshal it differently from JSON than the default. It works great.

However, when I pass a type alias of that struct to json.Marshal or
json.Unmarshal, the MarshalJSON and UnmarshalJSON functions aren't invoked,
despite both types conforming to the interfaces.

Here's the shortest example I could make.
https://go.dev/play/p/pETWQB3CWxV

This is where this came up:
https://github.com/deepmap/oapi-codegen/issues/579

I did find a workaround, in redeclaring the MarshalJSON/UnmarshalJSON on
the aliased type, but I don't understand why this is necessary, and I'm
hoping someone who understands the innards of this better than I do could
enlighten me.

Thanks,
-- Marcin

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