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Describe what the name passed to json_sax::key and to a parser callback for parse_event_t::key holds when parsing JSON text: escapes are decoded to UTF-8, different spellings of a name yield identical strings, the name is validated before the call (invalid escapes or UTF-8 give a parse error and no key event), no normalization or case conversion is applied, the event precedes the ':' check, and duplicate names are reported once per occurrence. Also note that sax_parse passes binary-format keys unchanged. See discussion #5955. Signed-off-by: Niels Lohmann <mail@nlohmann.me>