This function is referred to, for example, here.
But
julia> normalize_string("Hello World!", decompose=true, compat=true, casefold=true, stripmark=true, stripignore=true)
ERROR: UndefVarError: `normalize_string` not defined
Stacktrace:
[1] top-level scope
@ REPL[11]:1
Do I need to qualify the name in some way or has the function gone away?