Improve 'trusted-suppress-native-method' — some methods cannot be suppressed

I tried to suppress `Math.floor` with
```
exploader.net#%#//scriptlet('trusted-suppress-native-method', 'Math.floor', '/([12]\d\.\d+|\d\.\d+)/', 'prevent')
```

but it fails. This is more of a question, but is it possible to suppress methods without argument such as `Math.random` and `Element.prototype.getBoundingClientRect`? `""` as the argment doesn't work.