v0.32.0 Node Substitution (include nodes)
$include Keyword Enhancements
The $include keyword allows you to merge a referenced config node tree into a specified path. By default, the node is merged under the current node. The order can be controlled with a numeric value:
< 0: Included below the current node.
> 0: Included above the current node.
0: Root node inclusion (default).
Nodes with identical orders have undefined behavior, and multiple nodes must have unique orders to avoid data loss. Nested includes and root/sub-node inclusions are supported.
Each include must specify a source and its parameters.