minetest_game/mods/default/stairgate_hack.lua

local walign_stairs = minetest.settings:get_bool("stairs_world_align")
if not walign_stairs then
    return
end
local stairs_ignore_str = minetest.settings:get("stairs_ignore") or ""
local stairs_ignore = {}
stairs_ignore_str:gsub("[^,]+",function(stairtype)
    stairs_ignore[stairtype] = true
end)
minetest.___local_register_node = minetest.register_node
minetest.register_node = function(...)
    local args = {...}
    if (args[2].drawtype == "nodebox") and (args[1]:match("stair")) then
        if not stairs_ignore[args[1]] then
            for index,tile in pairs(args[2].tiles) do
                if type(tile) == "table" then
                    tile.align_style = "world"
                end
            end
        end
    end
    minetest.___local_register_node(unpack(args))
end