Changes

* Memory -safety, which prevents crashes and thread-safety.** Crashes and security vulnerabilitiesare much less likely. (Roughly 70% of critical security vulnerabilities are due to memory safety bugs.)* Thread * The safetyguarantees allow code that is designed more actively for performance, which enables improved especially parallel performance via parallelism.* Nimbleness: the * The safety makes it easy to make guarantees allow significant changes to existing code to be made quickly and with confidence.* Pleasant Expressive and pleasant to use, particularly once a moderate level of experience has been reached.* Excellent compiler error messages.* Excellent documentation.