v4.9.2

• Detect parent cycles, sibling rings, mislinked siblings and stale last_child stamps in validate()
• Reject an ancestor of self as new sibling in checked_insert_after/checked_insert_before with AppendAncestor/PrependAncestor instead of creating a cycle or panicking, and mention insertion in their messages
• Make detach, detach_children, remove, remove_subtree and remove_children no-ops for removed, stale or out-of-range IDs instead of modifying a reused slot or panicking
• Panic in append_value, prepend_value, insert_after_value and insert_before_value for a removed node instead of attaching the new node to a freed slot
• Report the caller's location for panics of the mutating NodeId methods
• Clear the tree links of freed nodes
• Fix reverse iteration of following_siblings/preceding_siblings for parentless nodes and stale parents, and make it terminate for removed nodes
• Make live_count() O(1)
• Reject inconsistent arenas on deserialization, and unlink free slots that can no longer be reused
• Return None from get_node_id() for removed nodes
• Implement core::error::Error for NodeError without std, and fix no_std builds with the serde feature
• Make the par_iter feature enable std
• Remove unsafe code from the tree! macro expansion (indextree-macros 0.1.4)
• Run the README examples as doctests
• Restrict CI token permissions and group Dependabot updates