OpenSSL::Config#initialize_copy

static VALUE
config_initialize_copy(VALUE self, VALUE other)
{
    CONF *conf = GetConfig(self);
    VALUE str;
    BIO *bio;

    str = rb_funcall(other, rb_intern("to_s"), 0);
    rb_check_frozen(self);
    bio = ossl_obj2bio(&str);
    config_load_bio(conf, bio); /* Consumes BIO */
    rb_obj_freeze(self);
    return self;
}