Every improvement you make to an API pays huge dividends

This just makes the world a better place:

• $\alpha N_{users}$ more happines for all users;
• $\beta N_{users}$ less questions about how the library works;
• $\delta N_{users}$ less lines of documentation read;
• Chances are you will realize your abstractions are not all adequate. We realized this while refactoring the API of the looping primitives;