From the `Attribute` interface definition: https://github.com/lukso-network/lsp-utils/blob/2a76a56f5c43a16dfab3d8cdeec7d47869ec00ac/src/types/index.ts#L20 I think it should be `type: 'string' | 'number' | 'boolean'` or just `type: string`