diff --git a/b3d.lua b/b3d.lua
index 8afe538..11ffd81 100644
--- a/b3d.lua
+++ b/b3d.lua
@@ -1,4 +1,7 @@
-local metatable = {__index = getfenv(1)}
+local class = getfenv(1)
+local metatable = {__index = function(_self, key)
+	return rawget(class, key)
+end}
 
 --! experimental
 --+ Reads a single BB3D chunk from a stream
@@ -195,12 +198,17 @@ function read(stream)
 				flags = flags
 			}
 			while content() do
-				table.insert(bone, {
-					frame = int(),
-					position = position and vector3() or nil,
-					scale = scale and vector3() or nil,
-					rotation = rotation and quaternion() or nil
-				})
+				local frame = {frame = int()}
+				if position then
+					frame.position = vector3()
+				end
+				if scale then
+					frame.scale = vector3()
+				end
+				if rotation then
+					frame.rotation = quaternion()
+				end
+				table.insert(bone, frame)
 			end
 			-- Ensure frames are sorted ascending
 			table.sort(bone, function(a, b) return a.frame < b.frame end)
diff --git a/kdtree.lua b/kdtree.lua
index 73b3873..c36d107 100644
--- a/kdtree.lua
+++ b/kdtree.lua
@@ -1,4 +1,7 @@
-local metatable = {__index = getfenv(1)}
+local class = getfenv(1)
+local metatable = {__index = function(_self, key)
+	return rawget(class, key)
+end}
 
 distance = modlib.vector.distance
 
diff --git a/ranked_set.lua b/ranked_set.lua
index 2b5208f..46f5346 100644
--- a/ranked_set.lua
+++ b/ranked_set.lua
@@ -1,5 +1,7 @@
 local class = getfenv(1)
-local metatable = {__index = class}
+local metatable = {__index = function(_self, key)
+	return rawget(class, key)
+end}
 
 comparator = modlib.table.default_comparator
 
diff --git a/schema.lua b/schema.lua
index 31081a2..82e4e50 100644
--- a/schema.lua
+++ b/schema.lua
@@ -1,8 +1,11 @@
-local schema = getfenv(1)
+local class = getfenv(1)
+local metatable = {__index = function(_self, key)
+	return rawget(class, key)
+end}
 
 function new(def)
 	-- TODO type inference, sanity checking etc.
-	return setmetatable(def, {__index = schema})
+	return setmetatable(def, metatable)
 end
 
 local function field_name_to_title(name)
diff --git a/trie.lua b/trie.lua
index badc9e5..5581b89 100644
--- a/trie.lua
+++ b/trie.lua
@@ -1,6 +1,9 @@
-local trie = getfenv(1)
+local class = getfenv(1)
+local metatable = {__index = function(_self, key)
+	return rawget(class, key)
+end}
 
-function new(table) return setmetatable(table or {}, trie) end
+function new(table) return setmetatable(table or {}, metatable) end
 
 function insert(self, word, value, overwrite)
 	for i = 1, word:len() do
diff --git a/vector.lua b/vector.lua
index 60379cc..9f2162a 100644
--- a/vector.lua
+++ b/vector.lua
@@ -1,5 +1,5 @@
 local mt_vector = vector
-local vector = getfenv(1)
+local class = getfenv(1)
 
 index_aliases = {
 	x = 1,
@@ -16,7 +16,7 @@ metatable = {
 		if index ~= nil then
 			return table[index]
 		end
-		return vector[key]
+		return rawget(class, key)
 	end,
 	__newindex = function(table, key, value)
 		local index = letters[key]