Update FAQ 8 with shorter version of clean-and-minimize idiom.
Credits to @pah who suggested it in comment to #368.
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* Alternatively, use equivalent of the [C++ swap with temporary idiom](https://en.wikibooks.org/wiki/More_C%2B%2B_Idioms/Clear-and-minimize):
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* Alternatively, use equivalent of the [C++ swap with temporary idiom](https://en.wikibooks.org/wiki/More_C%2B%2B_Idioms/Clear-and-minimize):
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```
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```
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d.Swap(Value(kObjectType).Move())
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Value(kObjectType).Swap(d);
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```
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or equivalent, but sightly longer to type:
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```
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d.Swap(Value(kObjectType).Move());
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```
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```
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## Document/Value (DOM)
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## Document/Value (DOM)
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