This is awesome! Substrate VM not being open source was a major reason I wasn't more excited about Truffle/Graal. Without Substrate VM, startup times for Truffl

This is awesome! Substrate VM not being open source was a major reason I wasn't more excited about Truffle/Graal. Without Substrate VM, startup times for Truffle-based interpreters are terrible (see http://nirvdrum.com/2017/02/15/truffleruby-on-the-substrate-vm.html http://nirvdrum.com/2017/02/15/truffleruby-on-the-substrate-...). Now anyone outside of Oracle can write cool JIT compilers using Truffle, and have them start quickly! I think it can also be used to compile normal Java programs to native executables. So great. I was worried that Oracle would keep Substrate VM as a proprietary secret sauce, but that would have really torpedoed the potential of Graal.