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clarify text about '<<' promotions
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@utoddl
utoddl committed Oct 14, 2019
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We can do this by adding some "`<<`" promotion prefixes to selected dict keys.
A promotion prefix is "`<<`" followed by an optional modifier:

* "`<<`" &mdash; (no modifier) promoted matching keys are replaced by promoted keys.
* "`<<|`" &mdash; promoted matching keys are deep merged, lists are joined and flattened.
* "`<<-`" &mdash; promoted matching keys are deep merged, lists are joined, flattened, and uniqified.
* "`<<`" &mdash; (no modifier) pre-existing matching keys are replaced by promoted keys.
* "`<<|`" &mdash; pre-existing and promoted matching keys are deep merged, lists are joined and flattened.
* "`<<-`" &mdash; pre-existing and promoted matching keys are deep merged, lists are joined, flattened, and uniqified.

Here's our example again with promotion prefixes applied to the "`owner`" keys:

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