If we were to take the strict position of "never break existing code," we would be forced to reject this useful new feature.
如果我们有严格地立场，“从不破坏现有代码”，那么我们将被迫拒绝这项有用的新功能。
2
This means that a variable may reject attempts to set its value to something malicious or simply nonsensical by referring to a regular expression (or even a piece of code).