he/him 
for 1 level deep? yes, but they might still access variables / crawl prototype chain and mutate the origin realm
Is Object.freeze on an object enough to ensure security/integrity when sharing an object across multiple realms? ie. no way to modify.
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(obj_from_other_realm).toString.constructor("console.log('awwww yea')")
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In Javascript? In browsers? I'm sure it's completely immutable and totally secure, I wouldn't worry about it.
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what's cooler than freeze? deepFreeze! https://developer.mozilla.org/en/docs/Web/JavaScript/Reference/Global_Objects/Object/freeze …
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it seems to be http://stackoverflow.com/a/19293418
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last time I checked it was secure/freeze enough
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if you recursively freeze all properties on that object I would say yes.
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I'd just stringify and send. Use a marshalling format if necessary. Objects are unsafe by default.
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