diff --git a/.luacheckrc b/.luacheckrc
index 1ef8061..78f01ca 100644
--- a/.luacheckrc
+++ b/.luacheckrc
@@ -23,6 +23,7 @@ globals = {
 }
 
 exclude_files = {
+	"tests/test_compression.lua",
 	"tests/test_custom_recipes.lua",
 	"tests/test_tabs.lua",
 }
diff --git a/API.md b/API.md
index b61ead1..7f11870 100644
--- a/API.md
+++ b/API.md
@@ -196,8 +196,8 @@ They can be used like so: `<optional_name> +<filter name>=<value1>,<value2>,<...
 
 Example usages:
 
-- `+groups=cracky,crumbly`: search for groups `cracky` and `crumbly` in all items.
-- `wood +groups=flammable`: search for group `flammable` amongst items which contain
+- `+groups=cracky,crumbly` -> search for groups `cracky` and `crumbly` in all items.
+- `wood +groups=flammable` -> search for group `flammable` amongst items which contain
   `wood` in their names.
 
 Notes:
@@ -252,9 +252,9 @@ i3.compress("default:diamondblock", {
 
 ```
 
-#### `i3.get_compress_groups()`
+#### `i3.compress_groups`
 
-Returns a map of all compressed item groups, indexed by stereotypes.
+A map of all compressed item groups, indexed by stereotypes.
 
 ---
 
diff --git a/etc/api.lua b/etc/api.lua
index 45edbf3..aca7662 100644
--- a/etc/api.lua
+++ b/etc/api.lua
@@ -1,17 +1,10 @@
 local make_fs = i3.files.gui()
 
-local S, fmt, reg_items = i3.need("S", "fmt", "reg_items")
 local gmatch, match, split = i3.need("gmatch", "match", "split")
+local S, err, fmt, reg_items = i3.need("S", "err", "fmt", "reg_items")
 local sort, concat, copy, insert, remove = i3.need("sort", "concat", "copy", "insert", "remove")
-local true_str, is_str, is_table, clean_name = i3.need("true_str", "is_str", "is_table", "clean_name")
-
-local function err(str)
-	return core.log("error", str)
-end
-
-local function is_func(x)
-	return type(x) == "function"
-end
+local true_str, true_table, is_str, is_func, is_table, clean_name =
+	i3.need("true_str", "true_table", "is_str", "is_func", "is_table", "clean_name")
 
 function i3.register_craft_type(name, def)
 	if not true_str(name) then
@@ -47,7 +40,7 @@ function i3.register_craft(def)
 		return
 	end
 
-	if not is_table(def) or not next(def) then
+	if not true_table(def) then
 		return err "i3.register_craft: craft definition missing"
 	end
 
@@ -180,7 +173,7 @@ end
 local set_fs = i3.set_fs
 
 function i3.new_tab(def)
-	if not is_table(def) or not next(def) then
+	if not true_table(def) then
 		return err "i3.new_tab: tab definition missing"
 	end
 
@@ -242,7 +235,7 @@ function i3.set_tab(player, tabname)
 end
 
 function i3.override_tab(tabname, newdef)
-	if not is_table(newdef) or not next(newdef) then
+	if not true_table(newdef) then
 		return err "i3.override_tab: tab definition missing"
 	end
 
@@ -290,7 +283,7 @@ function i3.compress(item, def)
 		return err "i3.compress: item name missing"
 	end
 
-	if not is_table(def) then
+	if not true_table(def) then
 		return err "i3.compress: replace definition missing"
 	end
 
@@ -315,8 +308,4 @@ function i3.compress(item, def)
 	end
 end
 
-function i3.get_compress_groups()
-	return i3.compress_groups
-end
-
 return set_fs, i3.set_tab
diff --git a/etc/common.lua b/etc/common.lua
index 65ff741..a154416 100644
--- a/etc/common.lua
+++ b/etc/common.lua
@@ -1,9 +1,38 @@
 local translate = core.get_translated_string
+local insert, remove, floor, vec_add, vec_mul =
+	table.insert, table.remove, math.floor, vector.add, vector.mul
 local fmt, find, gmatch, match, sub, split, lower =
 	string.format, string.find, string.gmatch, string.match, string.sub, string.split, string.lower
 local reg_items, reg_nodes, reg_craftitems, reg_tools =
 	core.registered_items, core.registered_nodes, core.registered_craftitems, core.registered_tools
 
+local S = core.get_translator "i3"
+local ES = function(...) return core.formspec_escape(S(...)) end
+
+local function is_num(x)
+	return type(x) == "number"
+end
+
+local function is_str(x)
+	return type(x) == "string"
+end
+
+local function is_table(x)
+	return type(x) == "table"
+end
+
+local function is_func(x)
+	return type(x) == "function"
+end
+
+local function true_str(str)
+	return is_str(str) and str ~= ""
+end
+
+local function true_table(x)
+	return is_table(x) and next(x)
+end
+
 local function reset_compression(data)
 	data.alt_items = nil
 	data.expand = ""
@@ -76,6 +105,14 @@ local function search(data)
 	data.items = filtered_list
 end
 
+local function table_replace(t, val, new)
+	for k, v in pairs(t) do
+		if v == val then
+			t[k] = new
+		end
+	end
+end
+
 local function table_merge(t1, t2, hash)
 	t1 = t1 or {}
 	t2 = t2 or {}
@@ -96,6 +133,86 @@ local function table_merge(t1, t2, hash)
 	return t1
 end
 
+local function array_diff(t1, t2)
+	local hash = {}
+
+	for i = 1, #t1 do
+		local v = t1[i]
+		hash[v] = true
+	end
+
+	for i = 1, #t2 do
+		local v = t2[i]
+		hash[v] = nil
+	end
+
+	local diff, c = {}, 0
+
+	for i = 1, #t1 do
+		local v = t1[i]
+		if hash[v] then
+			c = c + 1
+			diff[c] = v
+		end
+	end
+
+	return diff
+end
+
+local function table_eq(T1, T2)
+	local avoid_loops = {}
+
+	local function recurse(t1, t2)
+		if type(t1) ~= type(t2) then return end
+
+		if not is_table(t1) then
+			return t1 == t2
+		end
+
+		if avoid_loops[t1] then
+			return avoid_loops[t1] == t2
+		end
+
+		avoid_loops[t1] = t2
+		local t2k, t2kv = {}, {}
+
+		for k in pairs(t2) do
+			if is_table(k) then
+				insert(t2kv, k)
+			end
+
+			t2k[k] = true
+		end
+
+		for k1, v1 in pairs(t1) do
+			local v2 = t2[k1]
+			if type(k1) == "table" then
+				local ok
+				for i = 1, #t2kv do
+					local tk = t2kv[i]
+					if table_eq(k1, tk) and recurse(v1, t2[tk]) then
+						remove(t2kv, i)
+						t2k[tk] = nil
+						ok = true
+						break
+					end
+				end
+
+				if not ok then return end
+			else
+				if v2 == nil then return end
+				t2k[k1] = nil
+				if not recurse(v1, v2) then return end
+			end
+		end
+
+		if next(t2k) then return end
+		return true
+	end
+
+	return recurse(T1, T2)
+end
+
 local function is_group(item)
 	return sub(item, 1, 6) == "group:"
 end
@@ -162,16 +279,25 @@ local function compressible(item, data)
 	return compression_active(data) and i3.compress_groups[item]
 end
 
-local function is_str(x)
-	return type(x) == "string"
+local function clean_name(item)
+	if sub(item, 1, 1) == ":" or sub(item, 1, 1) == " " or sub(item, 1, 1) == "_" then
+		item = sub(item, 2)
+	end
+
+	return item
 end
 
-local function is_table(x)
-	return type(x) == "table"
+local function msg(name, str)
+	return core.chat_send_player(name, fmt("[i3] %s", str))
 end
 
-local function true_str(str)
-	return is_str(str) and str ~= ""
+local function err(str)
+	return core.log("error", str)
+end
+
+local function round(num, decimal)
+	local mul = 10 ^ decimal
+	return floor(num * mul + 0.5) / mul
 end
 
 local function is_fav(favs, query_item)
@@ -216,118 +342,98 @@ local function sort_by_category(data)
 	data.items = new
 end
 
-local function clean_name(item)
-	if sub(item, 1, 1) == ":" or sub(item, 1, 1) == " " or sub(item, 1, 1) == "_" then
-		item = sub(item, 2)
-	end
-
-	return item
-end
-
-local function msg(name, str)
-	return core.chat_send_player(name, fmt("[i3] %s", str))
-end
-
 local function spawn_item(player, stack)
 	local dir     = player:get_look_dir()
 	local ppos    = player:get_pos()
 	      ppos.y  = ppos.y + 1.625
-	local look_at = vector.add(ppos, vector.multiply(dir, 1))
+	local look_at = vec_add(ppos, vec_mul(dir, 1))
 
 	core.add_item(look_at, stack)
 end
 
-local S = core.get_translator "i3"
-local ES = function(...) return core.formspec_escape(S(...)) end
-
 return {
-	groups = {
-		is_group = is_group,
-		extract_groups = extract_groups,
-		item_has_groups = item_has_groups,
-		groups_to_items = groups_to_items,
-	},
+	-- Groups
+	is_group = is_group,
+	extract_groups = extract_groups,
+	item_has_groups = item_has_groups,
+	groups_to_items = groups_to_items,
 
-	compression = {
-		compressible = compressible,
-		compression_active = compression_active,
-	},
+	-- Compression
+	compressible = compressible,
+	compression_active = compression_active,
 
-	sorting = {
-		search = search,
-		sort_by_category = sort_by_category,
-		apply_recipe_filters = apply_recipe_filters,
-	},
+	-- Sorting
+	search = search,
+	sort_by_category = sort_by_category,
+	apply_recipe_filters = apply_recipe_filters,
 
-	misc = {
-		msg = msg,
-		is_fav = is_fav,
-		show_item = show_item,
-		spawn_item = spawn_item,
-		table_merge = table_merge,
-	},
+	-- Misc. functions
+	err = err,
+	msg = msg,
+	is_fav = is_fav,
+	is_str = is_str,
+	is_num = is_num,
+	is_func = is_func,
+	show_item = show_item,
+	spawn_item = spawn_item,
+	true_str = true_str,
+	true_table = true_table,
+	clean_name = clean_name,
 
-	core = {
-		clr = core.colorize,
-		ESC = core.formspec_escape,
-		check_privs = core.check_player_privs,
-	},
+	-- Core functions
+	clr = core.colorize,
+	ESC = core.formspec_escape,
+	check_privs = core.check_player_privs,
 
-	reg = {
-		reg_items = core.registered_items,
-		reg_nodes = core.registered_nodes,
-		reg_craftitems = core.registered_craftitems,
-		reg_tools = core.registered_tools,
-		reg_entities = core.registered_entities,
-		reg_aliases = core.registered_aliases,
-	},
+	-- Registered items
+	reg_items = core.registered_items,
+	reg_nodes = core.registered_nodes,
+	reg_tools = core.registered_tools,
+	reg_aliases = core.registered_aliases,
+	reg_entities = core.registered_entities,
+	reg_craftitems = core.registered_craftitems,
 
-	i18n = {
-		S = S,
-		ES = ES,
-		translate = core.get_translated_string,
-	},
+	-- i18n
+	S = S,
+	ES = ES,
+	translate = core.get_translated_string,
 
-	string = {
-		fmt = string.format,
-		find = string.find,
-		gmatch = string.gmatch,
-		match = string.match,
-		sub = string.sub,
-		split = string.split,
-		upper = string.upper,
-		lower = string.lower,
+	-- String
+	sub = string.sub,
+	find = string.find,
+	fmt = string.format,
+	upper = string.upper,
+	lower = string.lower,
+	split = string.split,
+	match = string.match,
+	gmatch = string.gmatch,
 
-		is_str = is_str,
-		true_str = true_str,
-		clean_name = clean_name,
-	},
+	-- Table
+	maxn = table.maxn,
+	sort = table.sort,
+	copy = table.copy,
+	concat = table.concat,
+	insert = table.insert,
+	remove = table.remove,
+	indexof = table.indexof,
+	is_table = is_table,
+	table_eq = table_eq,
+	table_merge = table_merge,
+	table_replace = table_replace,
+	array_diff = array_diff,
 
-	table = {
-		maxn = table.maxn,
-		sort = table.sort,
-		concat = table.concat,
-		copy = table.copy,
-		insert = table.insert,
-		remove = table.remove,
-		indexof = table.indexof,
+	-- Math
+	round = round,
+	min = math.min,
+	max = math.max,
+	ceil = math.ceil,
+	floor = math.floor,
+	random = math.random,
 
-		is_table = is_table,
-	},
-
-	math = {
-		min = math.min,
-		max = math.max,
-		floor = math.floor,
-		ceil = math.ceil,
-		random = math.random,
-	},
-
-	vec = {
-		vec_new = vector.new,
-		vec_add = vector.add,
-		vec_mul = vector.multiply,
-		vec_eq = vector.equals,
-		vec_round = vector.round,
-	},
+	-- Vectors
+	vec_new = vector.new,
+	vec_add = vector.add,
+	vec_round = vector.round,
+	vec_eq = vector.equals,
+	vec_mul = vector.multiply,
 }
diff --git a/etc/gui.lua b/etc/gui.lua
index 2415170..2421ee2 100644
--- a/etc/gui.lua
+++ b/etc/gui.lua
@@ -3,25 +3,17 @@ local damage_enabled = core.settings:get_bool "enable_damage"
 local model_aliases = i3.files.model_alias()
 local PNG, styles, fs_elements = i3.files.styles()
 
-local clr, ESC = i3.need("clr", "ESC")
 local S, ES, translate = i3.need("S", "ES", "translate")
-local min, max, floor, ceil = i3.need("min", "max", "floor", "ceil")
+local clr, ESC, check_privs = i3.need("clr", "ESC", "check_privs")
+local min, max, floor, ceil, round = i3.need("min", "max", "floor", "ceil", "round")
 local sprintf, find, match, sub, upper = i3.need("fmt", "find", "match", "sub", "upper")
 local reg_items, reg_tools, reg_entities = i3.need("reg_items", "reg_tools", "reg_entities")
 local maxn, sort, concat, copy, insert, remove = i3.need("maxn", "sort", "concat", "copy", "insert", "remove")
 
+local true_str, is_fav, is_num = i3.need("true_str", "is_fav", "is_num")
 local is_group, extract_groups, item_has_groups = i3.need("is_group", "extract_groups", "item_has_groups")
-local groups_to_items, compression_active, compressible, true_str, is_fav =
-	i3.need("groups_to_items", "compression_active", "compressible", "true_str", "is_fav")
-
-local function is_num(x)
-	return type(x) == "number"
-end
-
-local function round(num, decimal)
-	local mul = 10 ^ decimal
-	return floor(num * mul + 0.5) / mul
-end
+local groups_to_items, compression_active, compressible =
+	i3.need("groups_to_items", "compression_active", "compressible")
 
 local function fmt(elem, ...)
 	if not fs_elements[elem] then
@@ -290,7 +282,7 @@ local function get_waypoint_fs(fs, data, player, yextra, ctn_len)
 		fs("image_button", ctn_len - 1.5, yi, icon_size, icon_size, "", vsb, "")
 		fs(fmt("tooltip[%s;%s]", vsb, v.hide and ES"Show waypoint" or ES"Hide waypoint"))
 
-		if core.check_player_privs(player, {teleport = true}) then
+		if check_privs(player, {teleport = true}) then
 			local tp = fmt("waypoint_%u_teleport", i)
 
 			fs(fmt("style[%s;fgimg=%s;fgimg_hovered=%s;content_offset=0]",
diff --git a/etc/inventory.lua b/etc/inventory.lua
index 1792b69..5cd36d5 100644
--- a/etc/inventory.lua
+++ b/etc/inventory.lua
@@ -8,10 +8,13 @@ local fmt, find, match, sub, lower = i3.need("fmt", "find", "match", "sub", "low
 local vec_new, vec_mul, vec_eq, vec_round = i3.need("vec_new", "vec_mul", "vec_eq", "vec_round")
 local sort, copy, insert, remove, indexof = i3.need("sort", "copy", "insert", "remove", "indexof")
 
-local is_group, extract_groups, groups_to_items = i3.need("is_group", "extract_groups", "groups_to_items")
-local search, sort_by_category, apply_recipe_filters = i3.need("search", "sort_by_category", "apply_recipe_filters")
-local msg, is_str, is_fav, show_item, spawn_item, clean_name, compressible =
-	i3.need("msg", "is_str", "is_fav", "show_item", "spawn_item", "clean_name", "compressible")
+local msg, is_str, is_fav = i3.need("msg", "is_str", "is_fav")
+local is_group, extract_groups, groups_to_items =
+	i3.need("is_group", "extract_groups", "groups_to_items")
+local search, sort_by_category, apply_recipe_filters =
+	i3.need("search", "sort_by_category", "apply_recipe_filters")
+local show_item, spawn_item, clean_name, compressible, check_privs =
+	i3.need("show_item", "spawn_item", "clean_name", "compressible", "check_privs")
 
 local old_is_creative_enabled = core.is_creative_enabled
 
@@ -20,7 +23,7 @@ function core.is_creative_enabled(name)
 		return old_is_creative_enabled(name)
 	end
 
-	return core.check_player_privs(name, {creative = true}) or old_is_creative_enabled(name)
+	return check_privs(name, {creative = true}) or old_is_creative_enabled(name)
 end
 
 local function reset_data(data)
diff --git a/etc/progressive.lua b/etc/progressive.lua
index 4fc72fa..4076b31 100644
--- a/etc/progressive.lua
+++ b/etc/progressive.lua
@@ -1,38 +1,13 @@
 local set_fs = i3.files.api()
 local singleplayer = core.is_singleplayer()
 
-local fmt, search, table_merge, is_group, extract_groups, item_has_groups, apply_recipe_filters =
-	i3.need("fmt", "search", "table_merge", "is_group", "extract_groups", "item_has_groups", "apply_recipe_filters")
+local fmt, search, table_merge, array_diff = i3.need("fmt", "search", "table_merge", "array_diff")
+local is_group, extract_groups, item_has_groups, apply_recipe_filters =
+	i3.need("is_group", "extract_groups", "item_has_groups", "apply_recipe_filters")
 
 local POLL_FREQ = 0.25
 local HUD_TIMER_MAX = 1.5
 
-local function array_diff(t1, t2)
-	local hash = {}
-
-	for i = 1, #t1 do
-		local v = t1[i]
-		hash[v] = true
-	end
-
-	for i = 1, #t2 do
-		local v = t2[i]
-		hash[v] = nil
-	end
-
-	local diff, c = {}, 0
-
-	for i = 1, #t1 do
-		local v = t1[i]
-		if hash[v] then
-			c = c + 1
-			diff[c] = v
-		end
-	end
-
-	return diff
-end
-
 local function get_filtered_items(player, data)
 	local items, known, c = {}, 0, 0
 
diff --git a/etc/recipes.lua b/etc/recipes.lua
index 1054fde..0780952 100644
--- a/etc/recipes.lua
+++ b/etc/recipes.lua
@@ -2,73 +2,12 @@ local replacements = {fuel = {}}
 
 local fmt, match = i3.need("fmt", "match")
 local reg_items, reg_aliases = i3.need("reg_items", "reg_aliases")
-local maxn, copy, insert, remove = i3.need("maxn", "copy", "insert", "remove")
+local maxn, copy, insert = i3.need("maxn", "copy", "insert")
 
-local true_str, is_table, show_item, table_merge = i3.need("true_str", "is_table", "show_item", "table_merge")
 local is_group, extract_groups, item_has_groups, groups_to_items =
 	i3.need("is_group", "extract_groups", "item_has_groups", "groups_to_items")
-
-local function table_replace(t, val, new)
-	for k, v in pairs(t) do
-		if v == val then
-			t[k] = new
-		end
-	end
-end
-
-local function table_eq(T1, T2)
-	local avoid_loops = {}
-
-	local function recurse(t1, t2)
-		if type(t1) ~= type(t2) then return end
-
-		if not is_table(t1) then
-			return t1 == t2
-		end
-
-		if avoid_loops[t1] then
-			return avoid_loops[t1] == t2
-		end
-
-		avoid_loops[t1] = t2
-		local t2k, t2kv = {}, {}
-
-		for k in pairs(t2) do
-			if is_table(k) then
-				insert(t2kv, k)
-			end
-
-			t2k[k] = true
-		end
-
-		for k1, v1 in pairs(t1) do
-			local v2 = t2[k1]
-			if type(k1) == "table" then
-				local ok
-				for i = 1, #t2kv do
-					local tk = t2kv[i]
-					if table_eq(k1, tk) and recurse(v1, t2[tk]) then
-						remove(t2kv, i)
-						t2k[tk] = nil
-						ok = true
-						break
-					end
-				end
-
-				if not ok then return end
-			else
-				if v2 == nil then return end
-				t2k[k1] = nil
-				if not recurse(v1, v2) then return end
-			end
-		end
-
-		if next(t2k) then return end
-		return true
-	end
-
-	return recurse(T1, T2)
-end
+local true_str, is_table, show_item, table_merge, table_replace, table_eq =
+	i3.need("true_str", "is_table", "show_item", "table_merge", "table_replace", "table_eq")
 
 local function get_burntime(item)
 	return core.get_craft_result{method = "fuel", items = {item}}.time
diff --git a/init.lua b/init.lua
index 7d50377..e2e1326 100644
--- a/init.lua
+++ b/init.lua
@@ -71,14 +71,12 @@ function i3.need(...)
 	local t = {}
 
 	for _, var in ipairs {...} do
-		for _, cat in pairs(common) do
-		for name, func in pairs(cat) do
+		for name, func in pairs(common) do
 			if var == name then
 				t[#t + 1] = func
 				break
 			end
 		end
-		end
 	end
 
 	return unpack(t)
@@ -114,27 +112,6 @@ local function outdated(name)
 	core.show_formspec(name, "i3_outdated", fs)
 end
 
-local function init_data(player, info)
-	local name = player:get_player_name()
-	i3.data[name] = i3.data[name] or {}
-	local data = i3.data[name]
-
-	data.filter        = ""
-	data.pagenum       = 1
-	data.items         = i3.init_items
-	data.items_raw     = i3.init_items
-	data.favs          = {}
-	data.export_counts = {}
-	data.current_tab   = 1
-	data.current_itab  = 1
-	data.subcat        = 1
-	data.scrbar_inv    = 0
-	data.lang_code     = get_lang_code(info)
-	data.fs_version    = info.formspec_version
-
-	core.after(0, set_fs, player)
-end
-
 if rawget(_G, "armor") then
 	i3.modules.armor = true
 	armor:register_on_update(set_fs)
@@ -201,9 +178,7 @@ local function get_init_items()
 	end
 end
 
-core.register_on_mods_loaded(function()
-	get_init_items()
-
+local function disable_inventories()
 	if rawget(_G, "sfinv") then
 		function sfinv.set_player_inventory_formspec() return end
 		sfinv.enabled = false
@@ -212,7 +187,28 @@ core.register_on_mods_loaded(function()
 	if rawget(_G, "unified_inventory") then
 		function unified_inventory.set_inventory_formspec() return end
 	end
-end)
+end
+
+local function init_data(player, info)
+	local name = player:get_player_name()
+	i3.data[name] = i3.data[name] or {}
+	local data = i3.data[name]
+
+	data.filter        = ""
+	data.pagenum       = 1
+	data.items         = i3.init_items
+	data.items_raw     = i3.init_items
+	data.favs          = {}
+	data.export_counts = {}
+	data.current_tab   = 1
+	data.current_itab  = 1
+	data.subcat        = 1
+	data.scrbar_inv    = 0
+	data.lang_code     = get_lang_code(info)
+	data.fs_version    = info.formspec_version
+
+	core.after(0, set_fs, player)
+end
 
 local function init_waypoints(player)
 	local name = player:get_player_name()
@@ -235,24 +231,12 @@ local function init_waypoints(player)
 	end
 end
 
-core.register_on_joinplayer(function(player)
-	local name = player:get_player_name()
-	local info = core.get_player_information and core.get_player_information(name)
-
-	if not info or get_formspec_version(info) < i3.MIN_FORMSPEC_VERSION then
-		i3.data[name] = nil
-		return outdated(name)
-	end
-
-	init_data(player, info)
-	init_backpack(player)
-	init_waypoints(player)
-
+local function init_hudbar(player)
 	core.after(0, function()
 		player:hud_set_hotbar_itemcount(i3.HOTBAR_LEN)
 		player:hud_set_hotbar_image("i3_hotbar.png")
 	end)
-end)
+end
 
 local function save_data(player_name)
 	local _data = copy(i3.data)
@@ -272,6 +256,26 @@ local function save_data(player_name)
 	storage:set_string("data", slz(_data))
 end
 
+core.register_on_mods_loaded(function()
+	get_init_items()
+	disable_inventories()
+end)
+
+core.register_on_joinplayer(function(player)
+	local name = player:get_player_name()
+	local info = core.get_player_information and core.get_player_information(name)
+
+	if not info or get_formspec_version(info) < i3.MIN_FORMSPEC_VERSION then
+		i3.data[name] = nil
+		return outdated(name)
+	end
+
+	init_data(player, info)
+	init_backpack(player)
+	init_waypoints(player)
+	init_hudbar(player)
+end)
+
 core.register_on_leaveplayer(function(player)
 	local name = player:get_player_name()
 	save_data(name)