Readme for sequential-index-0.2.0.1
Sequential index numbers between 0.0 and 1.0 that allow arbitrarily inserting new numbers in between. They can possibly used for disk-based and other special containers, where adding a new element without changing the indexes of the other elements is important.
Conceptually, SequentialIndex denotes a path to an element in an imaginary binary tree, with a '1' at the end. Except for 0.0 and 1.0, which are logically on the left or on the right of the entire tree.
So logically, the tree looks roughly like this:
0.0 1.0
/
/----------/
0.1
/ \
/--/ \--\
/ \
0.01 0.11
/ \ / \
0.001 0.011 ...
Note that 0.0 is not connected to any other node, but it is still logically smaller than all nodes.