Decoder incorrectly adds named item to array result

[MicahZoltu]

When decoding an array of tuples, the name of the array is used as the name of the first array item in the resulting datastructure.

import { Wallet, providers, Contract, utils } from 'ethers'
const abi = [{"components":[{"name":"a","type":"uint256"},{"name":"b","type":"uint256"}],"name":"items","type":"tuple[]"}]
const encoded = '0x' +
'0000000000000000000000000000000000000000000000000000000000000020' +
'0000000000000000000000000000000000000000000000000000000000000002' +
'0000000000000000000000000000000000000000000000000000000000000003' +
'0000000000000000000000000000000000000000000000000000000000000004' +
'0000000000000000000000000000000000000000000000000000000000000005' +
'0000000000000000000000000000000000000000000000000000000000000006'
const result = new utils.AbiCoder().decode(abi, encoded)
console.log(result.items.items === undefined) // true

It is expected that the structure of the result would be result.items[0] and result.items[1].

Note: One can simply ignore the result.items.items but it is confusing when looking at the data in a debugger or printing it. And as always, it is a bug so could cause other problems down the road if not fixed.

[ricmoo]

This does seem to be a bug, and looks related to a bug I thought I'd fixed a month ago.

I will look into this and make sure it is fixed before the v4 release later this week.

Update: This was fixed in the v3 branch, but missed the v4 branch. It has been added. :)

[ricmoo]

This has been fixed in the latest version.

Thanks! :)