Returns the results of applying fn to each GDL object in the object
tree rooted at node in a ``depth-first'' tree traversal.
- arguments:
- node GDL object
- fn Function
- Operates on a single argument which is a GDL object
- optional arguments:
- accept? Function, Default Value: #'always
- Determines which nodes to accept in the final result
- prune? Function, Default Value: #'never
- Determines which nodes to prune from the tree traversal
- get-children Keyword symbol :children or Function, Default Value: :children
- Function applied to
a given node to get its children. The default, keyword symbol :children, uses the node's normal
children as returned by (the-object node children)
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