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Am i not still the same person i used to be?


Upon being presented with an award by the council for saving money by using the same broom for 20 years, a character in a famous British sitcom said:

And that's what I've done. Maintained it for 20 years. This old broom's had 17 new heads and 14 new handles in its time.

To which the inevitable response is, how the hell can it be the same bloody broom then?

This is an ancient question, best known as Theseus' paradox.

Most of the cells in your body aren't much more than a few years old. (Some are in it for the long haul - after adolescence we don't grow many more brain cells for example - we just start putting them to better use!) So are you the same person that you were 10 years ago?

If you think you are, what makes you the same person? What has been the constant factor that you can point to over the last ten years that allows you to consider yourself to be a continuation of the same person?

Now, to more practical matters, what constant factor can you point to over file changes that allows you to consider two files to be the same file? Write an algorithm to detect that factor. Job done.

package Cow { use Moo; has name => (is => 'lazy', default => sub { 'Mooington' }) } say Cow->new->name

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