[int_19h]

I think that's too extreme. There are many legitimate reasons to slice non-ASCII text - for example, to split it on newlines.

[mlindner]

That's not trivial and different languages vary in how they handle new line characters even. https://stackoverflow.com/questions/44995851/how-do-i-check-...

[int_19h]

You can still split non-ASCII text on ASCII newlines, and quite often that's exactly what needs to be done.

[Retra]

And usually, you don't want it to cost O(n) on top of whatever parser you ran to find those newlines.