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api/basic_json/object_t.md
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@@ -93,6 +93,15 @@ alphabetical order as `std::map` with `std::less` is used by default. Please not
[RFC 8259](https://tools.ietf.org/html/rfc8259), because any order implements the specified "unordered" nature of JSON
objects.
#### Cross-`basic_json` conversion requirements
When converting an object from one `basic_json` specialization to another via the
[converting constructor](basic_json.md#overload-4), the target `object_t`'s `key_type` must be
directly constructible from the source `basic_json`'s `string_t` type (or more generally, from the
source object's key type). If this requirement is not met, the conversion does not fail; instead,
the object is silently converted as an array of key-value pairs, which is incorrect. See
[issue #3425](https://github.com/nlohmann/json/issues/3425) for details and an example.
## Examples
??? example