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В данный момент, если мы попытаемся замаршалить что-то такое, без кастомных маршаллеров
то получим
{"example_map":{"":"val1","key2":"val2"}}
Если в тип выше добавить кастомные маршаллеры
То получим невалидный json
{"example_map":{null:"val1","key2":"val2"}}
И при попытке его обратно заанмаршалить получим ошибку:
panic: parse error: expected string near offset 20 of 'example_map'
Это происходит из-за использовании функции RawText
Предлагаю убрать возможность возвращения null для ключей мапы, т.к. это приводит к неочевидному поведению