Function
traverseDescendants
Common
```kotlin
fun DelegatableNode.traverseDescendants(
key: Any?,
block: (TraversableNode) -> TraverseDescendantsAction,
)
```
Conditionally executes `block` for each descendant with a matching `key`.
Note 1: For nodes that do not have the same key, it will continue to execute the `block` for
descendants below that non-matching node (where there may be a node that matches).
Note 2: The parameter `block`'s return value `TraverseDescendantsAction` will determine the next
step in the traversal.
traverseDescendants
Common
```kotlin
fun T.traverseDescendants(block: (T) -> TraverseDescendantsAction) where T : TraversableNode
```
Conditionally executes `block` for each descendant of the same class.
Note 1: For nodes that do not have the same key, it will continue to execute the `block` for the
descendants below that non-matching node (where there may be a node that matches).
Note 2: The parameter `block`'s return value `TraverseDescendantsAction` will determine the next
step in the traversal.