3D packing depth issue?

[pward123]

If I run this:

'use strict'

const {BP3D: { Item, Bin, Packer}} = require('binpackingjs')

const item = [18.75, 7.25, 4, 1]
const binOfFour = ['bin_of_4', 18.75 * 2, 7.25 * 2, 4 * 1, 10000]
const binOfEight = ['bin_of_8', 18.75 * 2, 7.25 * 2, 4 * 2, 10000]

const packIt = (itemProps, itemCount, binProps) => {
    const packer = new Packer()

    const bin = new Bin(...binProps)
    packer.addBin(bin)

    for (let i = -1; ++i < itemCount; ) {
        packer.addItem(new Item(`item_${i + 1}`, ...itemProps))
    }

    packer.pack()
    return {
        ...bin,
        items: bin.items.length,
    }
}

console.log(JSON.stringify(packIt(item, 20, binOfFour), null, 4))
console.log(JSON.stringify(packIt(item, 20, binOfEight), null, 4))

the result is this:

{
    "name": "bin_of_4",
    "width": 3750000,
    "height": 1450000,
    "depth": 400000,
    "maxWeight": 1000000000,
    "items": 4
}
{
    "name": "bin_of_8",
    "width": 3750000,
    "height": 1450000,
    "depth": 800000,
    "maxWeight": 1000000000,
    "items": 6
}

correct me if I'm wrong, but for bin_of_8 if i have a bin that's 2 times the width, 2 times the height and 2 times the depth of the items it holds, then 8 items should fit in the bin