Yes and no. There are ways around that for development like https://github.com/BeastyBlacksmith/ProtoStructs.jl https://github.com/BeastyBlacksmith/ProtoStructs

Yes and no. There are ways around that for development like https://github.com/BeastyBlacksmith/ProtoStructs.jl https://github.com/BeastyBlacksmith/ProtoStructs.jl. But changing the definition of actual structs isn't very feasable because what happens with the structs that use the old definition, i.e an array of them.