Notice/Warning on narrowStrings .length

[James Miller]

I'm writing an introduction/tutorial to using strings in D, 
paying particular attention to the complexities of UTF-8 and 16. 
I realised that when you want the number of characters, you 
normally actually want to use walkLength, not length. Is is 
reasonable for the compiler to pick this up during semantic 
analysis and point out this situation?

It's just a thought because a lot of the time, using length will 
get the right answer, but for the wrong reasons, resulting in 
lurking bugs. You can always cast to immutable(ubyte)[] or 
immutable(short)[] if you want to work with the actual bytes 
anyway.