Why in many games in the stack maximum can be 999 and not 1000?

I have not found this type of data so that it can hold a number equal to 1000. Why not round up to the nearest 1000?
April 19th 20 at 12:03
2 answers
April 19th 20 at 12:05
Less space in the UI is)
April 19th 20 at 12:07
because in the four digits 1000, and 999 three.
data types are nothing to do with it

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