How portable are Crystal binaries? Or more generally, how easy is it to share a Crystal program with someone who isn't a Crystal user? E.g. C and C++ requires a lot of esoteric knowledge w/ occasionally slow builds, Go isn't that bad but has an intrusive bad default GOPATH, Rust + Rustup is like Go with better defaults but relatively long compilation times, Python/Ruby need the runtime installed + some kind of isolating environment, NodeJS just needs the runtime + NPM, Perl needs some kind of CPAN setup which is really confusing for newbies, etc.