Abi: How does type set<uint8_t> generate abi type uint8[]

[YaCoHuang]

cdt-cpp version: 4.0.1

• std::set<uint8_t> order_ids;

This actually generates abi

{
    "name": "order_ids",
    "type": "bytes"
}

and it is expected to generate

{
    "name": "order_ids",
    "type": "uint8[]"
}

[bhazzard]

We need to investigate whether it has always worked this way or if this is a regression.

Of particular interest is making sure that an intuitive JSON representation of an array of integers results.

[ericpassmore]

Wharfkit/Antelope-Core handles Bytes as an array of UInt8 and should be agnostic of the change. https://github.com/wharfkit/antelope/blob/master/src/chain/bytes.ts#L9