How to read a List from a data source context?

[PaulRBerg]

The docs mention the possibility of defining an item of type List in the YAML subgraph manifest:

dataSources:
  - kind: ethereum/contract
    name: ContractName
    network: mainnet
    context:
      list_example:
        type: List
        data:
          - type: Int
            data: 1
          - type: Int
            data: 2
          - type: Int
            data: 3

But there is no guidance provided for how to read that list in an AssemblyScript mapping.

I wrote it like this but I'm not sure if it's correct:

export function getStringArray(key: string): string[] {
  const context = dataSource.context();
  const value = context.get("lockups");
  return value!.toStringArray();
}

Can anyone from Edge & Node please confirm this?