tpyo inserts value '2' to arrays

[lo1tuma]

I played a little bit with tpyo in the interactive node shell and noticed that tpyo inserts the value 2 to any array passed to the tpyo function.

$ node --harmony
> var tpyo = require('tpyo');
undefined
> var foobar = [1,2,3,4,5];
undefined
> foobar
[ 1, 2, 3, 4, 5 ]
> tpyo(foobar)
6
> foobar
[ 2,
  1,
  2,
  3,
  4,
  5 ]
> var t = [9,8,7,6,5]
undefined
> t
[ 9, 8, 7, 6, 5 ]
> tpyo(t)
6
> t
[ 2,
  9,
  8,
  7,
  6,
  5 ]
> t = ['a', 'b', 'c']
[ 'a', 'b', 'c' ]
> t
[ 'a', 'b', 'c' ]
> tpyo(t)
4
> t
[ 2, 'a', 'b', 'c' ]

[lo1tuma]

Here is another example without interactive shell:

var tpyo = require('tpyo');
var foobar = tpyo([1,2,3,4,5]);

console.log(foobar);
console.log(foobar.toStr1ng());

console.log(foobar) seems to be the problem.