class Sass::Script::Number

def self.const_missing(const)

This can be removed in 3.2.
Handles the deprecation warning for the PRECISION constant 
def self.const_missing(const)
  if const == :PRECISION
    Sass::Util.sass_warn("Sass::Script::Number::PRECISION is deprecated and will be removed in a future release. Use Sass::Script::Number.precision_factor instead.")
    const_set(:PRECISION, self.precision_factor)
  else
    super
  end
end