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Niels Lohmann
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When converting objects or strings between different basic_json specializations, the target's object_t::key_type or string_t must be directly constructible from the source's corresponding type. If this requirement is not met, the conversion silently falls back to the array-conversion path, producing incorrect results. This documents the limitation and provides references to issue #3425, which tracks this behavior. The comment in unit-alt-string.cpp is clarified to reference the known limitation with a link to the issue, and suggests the parse() workaround. Fixes #3425 (documentation; full fix deferred pending type-trait redesign) Signed-off-by: Niels Lohmann <mail@nlohmann.me>
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