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Niels Lohmann
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With JSON_USE_OBJECTS_FOR_ENUM_KEYED_MAPS, is_enum_keyed_map also matched std::multimap and std::unordered_multimap. Storing them as objects throws type_error.318 as soon as a key occurs twice, which is the normal case for a multimap, so such values could no longer be serialized at all once the macro was enabled, although they are stored losslessly as arrays of [key, value] pairs without it. Exclude maps with non-unique keys from is_enum_keyed_map. They are detected by insert(value_type) returning an iterator rather than a pair<iterator, bool>. Map-like types without such an insert() are still treated as before. Signed-off-by: Niels Lohmann <mail@nlohmann.me>
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