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Returns self if self is a String, or self converted to a String if self is a subclass of String.
String#to_str is an alias for String#to_s.
 
               static VALUE
rb_str_to_s(VALUE str)
{
    if (rb_obj_class(str) != rb_cString) {
        return str_duplicate(rb_cString, str);
    }
    return str;
}
            

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