async.each callback could be called more than once when array is modified

var async = require('async')

inputs = [1,2]
async.each(inputs,
    function (item, callback) {
        setTimeout(function(){callback()}, 1000)
    },
    function(err){
        console.log("async.each done")  
    })

inputs.splice(1,1)

/* output is:
async.each done
async.each done
*/

the problem is async use completed >= arr.length to check if call callback. however arr.length is less than async.each was called.

[aearly]

Modifying the array causes undefined behavior. If you need to modify the array, use async.queue.

[ORESoftware]

ok cool thanks