Feature request: mix() built-in function

I’d like to see mix() implemented and added to the built-in functions. Both LESS and SASS has this function, so it’s only fair that Stylus should have it as well.

mix() is used to easily mix two colors, like this: mix(#35c32d, #264ef3, 20%)

Reference: SASS documentation

[yuchi]

mix(a, b, m)
  require-color a
  require-color b
  if unit(m) is '%'
    m = unit(m / 100, '')
  n = 1 - m
  return a * m +  b * n

Should do the job

[Fresheyeball]

when passing color variables into the mix method, stylus always returns black

   DPLight  = #e8eced 

   #div 
          background mix(DPLight,white,50%)

returns

  #div{ 
          background:#020202;  
  }

expected result

 #div{ 
         background: #f4f6f7;
 }

I am using stylus 0.31.0, if my version is out of date now, and its fixed, I apologize.