underscore: keys, values, zip, max => undefined

crazyiness.js

var _ = require('underscore')._;

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var zipped = _.zip(_.keys(data), _.values(data));
console.log(zipped);
var max = _.max(zipped, function(el) {
  return el[1];
});

console.log(max);
console.log('The above should not be undefined, right?');

thisversionworks.js

var data = {"a":2.0, "b":3.0, "c":4.0};

var zipped = _.zip(_.keys(data), _.values(data));
console.log(zipped);
var max = _.max(zipped, function(el) {
  return el[1];
});

console.log(max);
console.log('The above is correct, unlike the first example.');