You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: node.go
    path of file: ./repos/awless/vendor/github.com/boltdb/bolt
    
    the code of the file until where you have to start completion: package bolt

import (
	"bytes"
	"fmt"
	"sort"
	"unsafe"
)

// node represents an in-memory, deserialized page.
type node struct {
	bucket     *Bucket
	isLeaf     bool
	unbalanced bool
	spilled    bool
	key        []byte
	pgid       pgid
	parent     *node
	children   nodes
	inodes     inodes
}

// root returns the top-lev
    
func (n *node) splitIndex(threshold int) (index, sz int) {
	sz = pageHeaderSize

	// Loop until we only have the minimum number of keys required for the second page.
	for i := 0; i < len(n.inodes)-minKeysPerPage; i++ {
		index = i
		inode := n.inodes[i]
		elsize := n.pageElementSize() + len(inode.key) + len(inode.value)

		// If we have at least the minimum number of keys and adding another
		// node would put us over the threshold then exit and return.
		if i >= minKeysPerPage && sz+elsize > threshold {
			break
		}

		// Add the element size to the total size.
		sz += elsize
	}

	return
}