Re: Coding system conversion error

[Richard Stallman]

    > Normally, the caller would instead use `STRING_SET_UNIBYTE' after the 
    > call
    > (or rather calls one of make_foo_string which does it for him) if 
    > needed.

This is not the same as what I suggested, but this too is ok.
However, if we stick with this, we should document it better
in the comments before allocate_string_data.