def plus(other)
      type = other.is_a?(Sass::Script::Value::String) ? other.type : :identifier
      Sass::Script::Value::String.new(to_s(:quote => :none) + other.to_s(:quote => :none), type)
    end
def plus(other)
      type = other.is_a?(Sass::Script::Value::String) ? other.type : :identifier
      Sass::Script::Value::String.new(to_s(:quote => :none) + other.to_s(:quote => :none), type)
    end
The SassScript `+` operation.

 @param other [Value] The right-hand side of the operator
 @return [Script::Value::String] A string containing both values
   without any separation