endianness problem in assetId in signAndSend

[sander2]

the signAndSend function takes an optional assetId. We've been trying to use this for statemine/statemint to pay tx fees using USDT. In our test scripts, we've got it working, but when we deploy our code it doesn't. When inspecting the constructed extrinsics, it seems that there is some inconsistency in endianness used for the serialization. When using signAndSend(address, { assetId: 1984 }) in our scripts, we see in the polkadotjs explorer that the assetId is 01 c0070000, which corresponds to Some(1984) using little endian encoding. However, when we deploy our code, we see that instead it has 01 000007c0. If we use { assetId: 3221684224 }, which is 0xc0070000, it works in the deployed code.

The type of the assetId is type AnyNumber = BN | bigint | Uint8Array | number | string;. We tried passing an explicit Uint8Array or string but that didn't work.

So it seems like somehow there is something wrong with the encoding of this assetId. Any help would be much appreciated

[jacogr]

Closed in #5716

[polkadot-js-bot]

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