Ignore case and support percentage

[Sarmay]

Hello! I like this library very much.
Percentile is not supported in recent use, I want it to Judge% followed by numbers using Mod function, if there is no or operator using percentile/100;
Also, doesn’t the library support case ignore? I use functions must be lowercase, uppercase or camel case writing is not recognized;
Finally, I want it to support both PI and PI () ; currently PI () and PI can not exist simultaneously;
Thank you very much!

你好！我非常喜欢这个函数库。
最近使用的时候发现不支持百分号，我想让它判断%后面是数字使用Mod函数，如果没有或者是运算符使用百分比/100；
还有，函数库不支持大小写忽略吗？我用函数的时候必须是小写，大写或者驼峰写法不识别；
最后一个问题，我想让它同时支持PI和PI()；目前PI()和PI不能同时存在；
非常感谢!