Fix -Wredundant-decls warning in json_type.h. (#1759)
Fix -Wredundant-decls warning in json_type.h. (#1759)

Co-authored-by: threadpoolexecutor <5924535f961e5c6046ed3bd3bcf92e58689bdc62@gmail.com>
lemire/simdjson,lemire/simdjson,lemire/simdjson,lemire/simdjson,lemire/simdjson,lemire/simdjson