A few minor changes were made to the "Bookmark.getNode()" function for
the purposes of improving readability and documentation clarity.
This process also led me to the conclusion that the "findNode()"
function should be refactored to throw an error if a node cannot be
found. This would lead to greater uniformity in the reporting of
failures to find a node. It is generally better style to have an error
thrown as close to the source as possible. A substantial change like
this should wait for now.
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