Comment by cyber_kinetist

LLVM uses a hand-rolled version of RTTI for the best performance (the parent constructor accepts its runtime type as an enum), and it seemed that the maintenance costs for it aren't that high. (See https://llvm.org/docs/HowToSetUpLLVMStyleRTTI.html)

Or if you're even lazier, you can easily make a more automatic RTTI system with some templates / macros that works much faster than dynamic_cast! (See https://github.com/royvandam/rtti)