Add precision option about postcss-calc HOT 3 CLOSED

postcss-calc is just a wrapper around reduce-css-calc.
But I'm guessing 5 are not enough ? I've used 5 cause Sass has 5 by default and it has not been used chosen randomly.

I will add asap the option, should be fast to do.
Same for preserve.

stylus & rework just have some big number due to default js way to compute (just try console.log(1 / 3 * 100) in your browser console & see what append).

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Thank you Maxime to take into account this suggestion.
In fact, 5 is too much. Most of the time, I only use 2 or 3.

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Precision 2 makes 100 / 3 work with IE. I can use the precision option though. no problem

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