- * A vector is a compound of a size and a vector_page pointer, which
- * when non-null points out the top-most page of the vector indexing
- * tree. The number of levels is derived from its size with level 0
- * being the leaf level of actual content. E.g., a vector larger than
- * 256 items, has at least two levels, and generally N levels may span
- * up to 256^N content entries.
+ * A vector struct is the "foot part" of an actual containing the
+ * applicable implementation variant for this vector, the intended
+ * slot size and a root pointer for the indexing structure, which
+ * consist of indexing pages according to the variant.
+ *
+ * Variant 0, 1 and 2, involves indexing pages of 256, 16 and 4
+ * pointers respectively. Variant 3 involves a single indexing page of
+ * the size of the vector.