Clever one, but I liked it and hope to use the new knowledge from it one day

It might need some readability but besides that, it's quite efficient.

This solution would be better if it used a named constant instead of the abstract value.

what a perfect sol...

same to same with different words

the joy of coding 😂 feel your pain

what about "\nbug" ? is it out of the scope of this kata ? some solutions would not detect it

Almost tied your solution for speed (yours is still a split hair faster) :]

Fun kata!

Approved!

python new test framework

This is perhaps the first such integer: 1125899940397056. For this input, the answer should be 1125899906842624, but it gives 1125899973951489.

And the total number of such safe integers is tens of millions.

wow, so good

very nice