Interestings

• Where’s my last bit?

  1.9.3p194 :019 > (2**62).class.name
  => “Bignum”
  1.9.3p194 :020 > (2**62 – 1).class.name
  => “Fixnum”

Q: Why is this not 2**63?
A: Fixnum object ids are the odd numbers, eg, 2.object_id = 5. This means you run out of bits one bit early.