Default precision too low

Can the default Number#precision be changed to a higher value?

Because it’s 5 now, and there is no standard way of setting precision across the forest of Sass environments (many not being Ruby), it causes lots of 1-px off errors, e.g. zurb/foundation#4336 and twbs/bootstrap-sass#409.

libsass also sets precision to 5 by default, same as ruby sass. Perhaps a higher value such as 10 is better as it would mean much less configuration pain for everyone?

---

ratio	rounded	error
2/3	66.66667%	0.33333333333E-5
1/6	16.66667%	0.33333333333E-5
3/7	42.85714%	-0.28571428571E-5
7/11	63.63636%	-0.36363636364E-5
7/31	22.58065%	0.48387096774E-5

p = 5
puts [2/3r, 1/6r, 3/7r, 7/11r, 7/31r].map { |r|
  v = r * 100
  rounded = BigDecimal.new(v, p + Math.log10(v).floor + 1)
  "| #{r} | #{rounded.to_s('F')}% | `#{(rounded - v).to_s('E')}` |" }

[glebm]

@lolmaus It is caused by Sass rounding “errors”, please see the issues linked above

[lolmaus]

The unwanted offset might be caused by browser rounding erros. See http://www.palantir.net/blog/responsive-design-s-dirty-little-secret