ICU default locale and setlocale

The following applies to Unix and other systems providing
setlocale.
The ICU default locale seems to not take into account setlocale
calls in a program. The default locale remains whatever was in
effect the first time the default locale was set. I would like to
have the default locale reflect the program's current locale.

Also related is the behavior of ucnv_setDefaultName. It returns
the encoding associated with the default locale if that can be
determined; if not it returns the value of the LC_CTYPE
environment variable by doing setlocale(LC_CTYPE, "").
The setlocale call should instead be setlocale(LC_CTYPE, NULL)
so that again the program's current locale is taken into account
and not the locale in effect when the program was launched.

Thanks,
Zartaj