Method code for $root.is_writable_by()

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---

arg obj;
var o;

for o in (.writers()) {
    if (o.has_ancestor($group)) {
        if (o.includes(obj))
            return 1;
    } else if (o == obj) {
        return 1;
    }
}
return $sys.is_system(obj);

// return (| obj in .writers() |) || $sys.is_system(obj);

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