code: func (b *Bucket) forEachPageNode(fn func(*page, *node, int)) {
  	// If we have an inline page or root node then just use that.
  	if b.page != nil {
  		fn(b.page, nil, 0)
  		return
  	}
  	b._forEachPageNode(b.root, 0, fn)
  }
docs: // forEachPageNode iterates over every page (or node) in a bucket.
  // This also includes inline pages.