Refactor argument variables
Implement times()
Revert "Option: No throw RuntimeException"

This reverts commit 7ad6c2628b17e3d61e063a51b2f3409fefca07a8.
Option: Implement exists() orElse() and orNull()
Implement findWhere() and findWhereSafe()
Implement iterate()
generate-enumerable-trait.php: Fix don't generate alias method
Optimize performance on has()
Refactor enumerable trait generator