Concerning "tokens", is the start-tag-ed-ness of a Token inseparable from being a Token? Or is it, rather, an attribute imposed by having a Grammar? (Of course, that speculation may be beyond the scope of a ::Simple module.)

About "deletion", I suggest contemplating this question: What response does the object implementing the collection of attributes within the Token give if it is asked to delete an attribute that it does not contain? :-)

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...every application I have ever worked on is a glorified munger...