* Use isIdentifierChar instead of regex for toIdentifier * Apply suggestions from code review Co-authored-by: Huáng Jùnliàng <jlhwung@gmail.com> * Undo dep * Update packages/babel-types/test/converters.js * Add testcase starting with a number * Add test for non-ascii starting character Co-authored-by: Huáng Jùnliàng <jlhwung@gmail.com>