@type t() ::
  %ArchAstro.SDK.Types.ChannelPayloads.ApiChatChannel.ApiChatPostMessage.Response.Nested.MessageUserVariant2{
    alias_: String.t() | nil | ArchAstro.SDK.Unset.t(),
    app: String.t() | nil | ArchAstro.SDK.Unset.t(),
    app_name: String.t() | nil | ArchAstro.SDK.Unset.t(),
    created_by_agent_user: String.t() | nil | ArchAstro.SDK.Unset.t(),
    created_by_developer: String.t() | nil | ArchAstro.SDK.Unset.t(),
    created_by_org: String.t() | nil | ArchAstro.SDK.Unset.t(),
    created_by_team: String.t() | nil | ArchAstro.SDK.Unset.t(),
    created_by_user: String.t() | nil | ArchAstro.SDK.Unset.t(),
    email: String.t() | nil | ArchAstro.SDK.Unset.t(),
    id: String.t(),
    is_system_user: boolean() | ArchAstro.SDK.Unset.t(),
    metadata:
      %{optional(String.t()) => ArchAstro.SDK.JSON.t()}
      | ArchAstro.SDK.Unset.t(),
    name: String.t() | nil | ArchAstro.SDK.Unset.t(),
    org: String.t() | nil | ArchAstro.SDK.Unset.t(),
    org_name: String.t() | nil | ArchAstro.SDK.Unset.t(),
    org_role: String.t() | nil | ArchAstro.SDK.Unset.t(),
    org_slug: String.t() | nil | ArchAstro.SDK.Unset.t(),
    sandbox: String.t() | nil | ArchAstro.SDK.Unset.t(),
    sandbox_name: String.t() | nil | ArchAstro.SDK.Unset.t()
  }