docs(aio): document the special treatment of undefined
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@ -142,7 +142,7 @@ The `hero` in `{{hero.name}}`
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refers to the template input variable, not the component's property.
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Template expressions cannot refer to anything in
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the global namespace. They can't refer to `window` or `document`. They
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the global namespace (except `undefined`). They can't refer to `window` or `document`. They
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can't call `console.log` or `Math.max`. They are restricted to referencing
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members of the expression context.
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