Funny while loop output in playground

Question

Why do i get more than one decimal in Ruby Code Playground?
I have this while loop:
x = 0
while x < 4
puts x
x += 0.2
end
and the output in playground:
0
0.2
0.4
0.6000000000000001
0.8
1.0
1.2
1.4
1.5999999999999999
1.7999999999999998
1.9999999999999998
2.1999999999999997
2.4
2.6
2.8000000000000003
3.0000000000000004
3.2000000000000006
3.400000000000001
3.600000000000001
3.800000000000001

Answer 1

Hahaha, I guess it's the playground error! Actually, it is not following the rules exactly as we specified!!!

Answer 2

Code Playground ftw xD