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store signed integers efficiently, as per protocol-buffers.

For unsigned integers use varint.

Integers are mapped to positive integers, so that positive integers become positive even numbers (n2) and negative integers become positive odd numbers. (n-2 - 1)

This is the same as moving the sign bit from the most significant possition to the least significant. Otherwise, varint will encode negative numbers as large integers.

var varint = require('varint')
var svarint = require('signed-varint')
console.log('unsigned', varint.encode(-1))
console.log('signed', svarint.encode(-1))
//=> unsigned [255,255,255, 15] 
//   signed [1]