class ViewModel::UpMigrator

def migrate_functional_update!(node, references:)

need to account for it here.
context-dependent meaning. Retrospectively this was a poor choice, but we
The functional update structure uses `_type` internally with a 
def migrate_functional_update!(node, references:)
  actions = node[ViewModel::ActiveRecord::ACTIONS_ATTRIBUTE]
  actions&.each do |action|
    action_type = action[ViewModel::TYPE_ATTRIBUTE]
    next unless NESTED_FUPDATE_TYPES.include?(action_type)
    values = action[ViewModel::ActiveRecord::VALUES_ATTRIBUTE]
    values&.each do |value|
      migrate_tree!(value, references: references)
    end
  end
end