Duplicate subtree and its data

[Jakz]

I'm trying to create a copy of a subtree of ryml::Tree instance which should outlive the original object. I'm using:

tree.rootref() |= ryml::MAP;
tree.duplicate_children(src.tree(), src.id(), tree.root_id(), ryml::NONE);

I can see that this correctly works but once the original tree which contains src is destroyed then the new subtree content is pointing to a dangling buffer.

Is there a simple yet efficient way to duplicate children on its own buffer, owned by the new tree?