\operatorname seems to be broken #106
Description
The following example results in a Parser Error when using this library (but no issues when using vanilla KaTeX):
\operatorname{Function}\left(x\right)Specifically, I get the error
Parser Error: Got function '\left' with no arguments as \operatorname
Looking at the source code, this error seems to have something to do with the greediness of \operatorname, but I'm not familiar enough with the parser to know what exactly I'm looking at.