Possible 'pure' bug with int[] slice. Programming in D page 174

[Brother Bill]

On Saturday, 4 October 2025 at 12:14:06 UTC, Dmitry Olshansky 
wrote:
> It’s weakly pure in that it could only mutate things that are 
> passed in. Strongly pure would require no mutable 
> pointers/slices/references.
> It may be misleading that it’s single keyword for both of 
> these. The good news is that strongly pure functions can call 
> weakly pure function and stay strongly pure.

So if we don't want to allow mutating passing in parameters, add 
'in' keyword to each parameter.  Then it should be strongly cure. 
  Is that correct?
```
int[] inner(in int[] slice) pure
```