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The Drei buffer is what holds textual and other objects to be edited and displayed. Conceptually, the buffer is a potentially large sequence of objects, most of which are expected to be characters (the full Unicode character set is supported). However, Drei buffers can contain any Common Lisp objects, as long as the syntax module knows how to render them.
The Drei buffer implementation differs from that of a vector, because it allows for very efficient editing operations, such as inserting and removing objects at arbitrary offsets.
In addition, the Drei buffer protocols defines that concept of a mark.