3.1.4 - 2019.06.15

• Refactoring. Many minor internal improvements and fixes like:
  • Improved Symbol.keyFor complexity to O(1)
  • Fixed the order of arguments validation in String.prototype.{ endsWith, includes, startsWith }
  • Internal implementation of RegExp#flags helper now respect dotAll flag (mainly ralated to the pure version)
  • Performace optimizations related old V8
  • Etc.