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build and maintain a tree from the sublevels in a leveldb instance
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Build and maintain a javascript tree from the sublevels in a leveldb instance. Faster than a full scan.


To initialize level-subtree

var Tree = require('level-subtree')
var db = require('level')('./db')
var tree = Tree(db)

var handle = tree.init(function(err, tree) {
  // creates a tree from the existing keys.

To update the tree...

handle.update(key) // use when adding a new sublevel.
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