namespace attribute table struct enum union rpc_service root_type include file_identifier file_extension bool byte ubyte short ushort int uint float long ulong double int8 uint8 int16 uint16 int32 uint32 int64 uint64 float32 float64 string true false deprecated required key hash id force_align bit_flags original_order nested_flatbuffer csharp_partial streaming idempotent cpp_type cpp_ptr_type native_inline