Is postcss-calc messed up?

[corysimmons]

Seems like it's not functioning completely correctly: peterramsing/lost#242 (comment)

[MoOx]

Please provide clear info about input, expected output, and actual output, your comment is not clear at all about your expectations.

[corysimmons]

Yeah sorry about the vague issue. Laziness on my part.

Does this clear it up?

// Lost creates this (works in IE)
width: calc(99.99% * 1/3 - (1rem - 1rem * 1/3));

// postcss-calc rounds it to this (doesn't work in IE)
width: calc(99.99% * 1/3 - 0.66667rem);

If precision is turned to 2 by default, it seems to work. It seems like IE can only deal with 2 precision (e.g. in IE 100px / 3 = 33.33px whereas in every other browser it's 33.328px). Is there a particular reason you picked 5 by default?

[corysimmons]

This issue should probably be migrated to postcss-calc