class Sass::Script::Value::Number

To set for all threads, be sure to set the precision on the main thread.
The numeric precision is stored as a thread local for thread safety reasons.
`3.1415926` will be printed as `3.142`.
For example, if this is `3`,
Sets the number of digits of precision

def self.precision=(digits)
  Thread.current[:sass_numeric_precision] = digits.round
  Thread.current[:sass_numeric_precision_factor] = nil
  Thread.current[:sass_numeric_epsilon] = nil
end