text: var between = require('./numbers')
  var base = 36
  function stringify(a) {
    return Array.isArray(a) ? a.map(function (e) {
      return e.toString(base)
    }).join(',') : a
  }
  
  function parse(a) {
    return a.split(',').map(function (n) {
      return parseInt(n, base)
    })
  }
  
  module.exports = function (lo, hi) {
    return stringify(between(parse(lo),parse(hi)))
  }
  
  module.exports.lo = stringify([0])
  module.exports.hi = stringify([Number.MAX_SAFE_INTEGER])
  
  