mpf_update_policy_bundle: can this be a list?

        Is it a design feature that "mpf_update_policy_bundle" can
        only specify a single bundle? Or perhaps a bug?

        (I can probably do a work-around of a single, higher-level
        bundle which itself then calls both my intended real
        bundles. But still...)

  It's by design that it's a single bundle.

  You can find the policy in `cfe_internal/update/update_policy.cf'.

  It looks to see if the specified bundle is found and then runs it.

  It becomes an slist because you defined it as a list/array. If defined
  as a list/array I expect that only the last defined bundle will get
  run because when it looks to make sure the specified bundle exists it
  uses `bundlesmatching()' taking the value of
  `def.mpf_update_policy_bundle' as the bundle to search for.

  ,----
  | # Look for a bundle that matches what the user wants
  | "found_matching_user_specified_bundle"
  |   slist => bundlesmatching( "$(def.mpf_update_policy_bundle)" );
  `----

  If `def.mpf_update_policy_bundle' is a list, then the value of
  `found_matching_user_specified_bundle' will be the result of
  `bundlesmatching()' against the last iterated element.

  If you want to run multiple bundles for the policy update then you
  should define just a single bundle which calls the others as `methods'
  promises.

  If you want to run other bundles as part of the update policy (not
  specific to policy update) see
  `def.control_common_update_bundlesequence_end'.

  If you think this should be more explicit, perhaps open a PR to add
  some additional note to the MPF docs or instrument the policy so that
  it emits reports if `def.mpf_update_policy_bundle' is not a string (
  see `type()', introduced in 3.18.0 ), or perhaps based on length

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