Review MR

• Closes #12 (closed) (performance improvement ~ x70!!!);
• Closes #11 (closed);
• Closes #10 (closed);
• Closes #8 (closed);
• Closes #6 (closed);
• Closes #4 (closed);
• Closes #3 (closed);
• Closes #5 (closed);
• New features:
  • Type annotations;
  • Benchmarking;
  • Coverage