使用packed = true原型文件读取非压缩重复字段

I just realized that there is an option for a more efficient use of protocol buffers to read/write arrays of primitives. I already have protobuf files without packed=true. My question is what happens when I add this option to my .proto and compile it. Will I be able to read the previously saved protobufs (that are not saved with this option)?I just realized that there is an option for a m