BigDecimal#to_s without trailing zero

gistfile1.rb

class BigDecimal
  def to_s(s = 'F')
    sign, significant_digits, base, exponent = self.split
    if self.zero?
      '0'
    elsif significant_digits.size <= exponent
      self.to_i.to_s
    else
      self.to_f.to_s
    end
  end
end

Probably not what you wanted...

irb(main):002:0> b = BigDecimal.new("9.0000000000000009")
=> #<BigDecimal:2ae7455445f0,'0.9000000000 0000009E1',27(27)>
irb(main):003:0> b.to_dig
=> "9.0"

Also probably shouldn't duck punch to_s. See my fork.