-- Classifications for actor resist/damage
_M.classifications = {
    unliving = {undead = true, construct = true, crystal = true},
    unnatural = {demon = true, elemental = true, horror = true, construct = true, undead = true},
    living = function(type) return not _M.classifications.unliving[type] end,
    natural = function(type) return not _M.classifications.unnatural[type] end,}

--- Check if the actor is a certain type or in an arbitrary set of classifications
-- @param string representing the classification to check
-- @return whether the actor is in this classification
function _M:checkClassification(type_str)
    -- Living and Natural are defined as not being Unliving or not Unnatural
    -- Thus, all actors are in one category or the other
    if not act or not type_str or not act.type then return end
    if act.type == type_str then return true end
    local class = _M.classifications[type_str]
    if _G.type(class) == 'function' then return class(type_str) end
    return class[act.type]
end