"assert inrange(var1,1,5)" and "assert inrange(var1,1,5)&!missing(var1)"

[li zhi]

What's the difference between "assert inrange(var1,1,5)" and "assert inrange(var1,1,5)&!missing(var1)"?If all values in var1 is between 1 and 5,var1 does contain no missing values.Why is there someone using the 2nd sentence?Can anyone say it clearly?

[Nick Cox]

If a value is between 1 and 5 it can't also be missing. There is no point to the second condition, but it does no harm either.

[li zhi]

Thanks！