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Customization point tag.
        Defined in header <boost/json/value_from.hpp>
      
struct value_from_tag
        This tag type is used by the function value_from to select overloads of
        tag_invoke.
      
This type is empty; it has no members.
        value_from,
        value_to,
        value_to_tag,
        tag_invoke:
        A general pattern for supporting customisable functions
      
        Convenience header <boost/json.hpp>