Can you give a specific reference to the place in the YAML spec that says this is allowed? I can only find statements about aliases to nodes (i.e. what you call pure aliases). I can't see any provision for substituting values and then adding to them. So the modules are simply implementing the YAML spec, on my reading.
You right i meant anchors and alias were features of yaml 1.0 and was wondering if i could change the alias value before inserting. I hoped that yaml supports something like this.
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