excel-formula-tokenizer

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Add option to keep prefix operators even in noop cases

2

Some Excel users start formulas always with a `=+` and thus, being able to have an option to keep even `noop` prefixes would be nice. E.g., in a formula like...

johannesboyne

`tokenize` cannot handle extra ")"

3

Sample Input: ```js tokenize(")") tokenize("1*1)") tokenize("f(x))") tokenize(") + 1") ``` Stack Trace (for any): ``` TypeError: Cannot read property 'type' of undefined at TokenStack.pop (.\node_modules\excel-formula-tokenizer\index.js:100:34) at tokenize (.\node_modules\excel-formula-tokenizer\index.js:480:32) ```

JakeThurman