Euler's formula does not equal because of Float in Ruby

Euler's formula does not equal because of Float in Ruby. Let's show the example at x = Π.

$ irb -rcmath
irb(main):001:0> include CMath
=> Object
irb(main):002:0> left_euler = exp(-1.0*sqrt(-1.0)*PI)
=> (-1.0-1.2246063538223773e-16i)
irb(main):003:0> right_euler = cos(PI) + sqrt(-1.0) * sin(PI)
=> (-1.0+1.2246063538223773e-16i)
irb(main):004:0> left_euler == right_euler
=> false
irb(main):005:0> left_euler === right_euler
=> false

(check also phosphorescence: Euler's formula in Ruby)