toString vs. toUtf8

[Walter Bright]

Phobos (and D) has undergone some evolution in the thinking about 
unicode strings, and it certainly has a few anachronisms in its names. 
But I think we've evolved to the point where going forward, we know what 
to do:

char[] => string
wchar[] => wstring
dchar[] => dstring

These are all unicode strings. Putting non-unicode encodings in them, 
even temporarily, should be discouraged. Non-unicode encodings should 
use ubyte[], ushort[], etc.