diff --git a/etc/dispatch.lua b/etc/dispatch.lua
index 31a1290..cab7f59 100644
--- a/etc/dispatch.lua
+++ b/etc/dispatch.lua
@@ -50,7 +50,7 @@ function socket.protect(f)
   return function(...)
     local co = coroutine.create(f)
     while true do
-      local results = {coroutine.resume(co, base.unpack(arg))}
+      local results = {coroutine.resume(co, ...)}
       local status = table.remove(results, 1)
       if not status then
         if base.type(results[1]) == 'table' then
@@ -104,8 +104,7 @@ local function cowrap(dispatcher, tcp, error)
     -- don't override explicitly.
     local metat = { __index = function(table, key)
         table[key] = function(...)
-            arg[1] = tcp
-            return tcp[key](base.unpack(arg))
+            return tcp[key](tcp,select(2,...))
         end
         return table[key]
     end}
diff --git a/ltn012.wiki b/ltn012.wiki
index b924dd3..96b13ae 100644
--- a/ltn012.wiki
+++ b/ltn012.wiki
@@ -126,8 +126,9 @@ local function chain2(f1, f2)
 end
 
 function filter.chain(...)
+    local arg = {...}
     local f = arg[1]
-    for i = 2, table.getn(arg) do
+    for i = 2, #arg do
         f = chain2(f, arg[i])
     end
     return f
@@ -235,9 +236,10 @@ end
 We can make these ideas even more powerful if we use a new feature of Lua 5.0: coroutines.  Coroutines suffer from a great lack of advertisement, and I am going to play my part here.  Just like lexical scoping, coroutines taste odd at first, but once you get used with the concept, it can save your day. I have to admit that using coroutines to implement our file source would be overkill, so let's implement a concatenated source factory instead.
         {{{
 function source.cat(...)
+    local arg = {...}
     local co = coroutine.create(function()
         local i = 1
-        while i <= table.getn(arg) do
+        while i <= #arg do
             local chunk, err = arg[i]()
             if chunk then coroutine.yield(chunk)
             elseif err then return nil, err 
diff --git a/ltn013.wiki b/ltn013.wiki
index 734b433..a622424 100644
--- a/ltn013.wiki
+++ b/ltn013.wiki
@@ -73,12 +73,12 @@ Fortunately, all these problems are very easy to solve and that's what we do in
 We used the {{pcall}} function to shield the user from errors that could be raised by the underlying implementation.  Instead of directly using {{pcall}} (and thus duplicating code) every time we prefer a factory that does the same job:
         {{{
 local function pack(ok, ...)
-    return ok, arg
+    return ok, {...}
 end
 
 function protect(f)
     return function(...)
-        local ok, ret = pack(pcall(f, unpack(arg)))
+        local ok, ret = pack(pcall(f, ...))
         if ok then return unpack(ret)
         else return nil, ret[1] end
     end
@@ -157,7 +157,7 @@ function newtry(f)
             if f then f() end 
             error(arg[2], 0)  
         else 
-            return unpack(arg) 
+            return ...
         end
     end
 end
diff --git a/test/utestclnt.lua b/test/utestclnt.lua
index eec6adc..01f55e5 100644
--- a/test/utestclnt.lua
+++ b/test/utestclnt.lua
@@ -4,24 +4,24 @@ local socket = require"socket.unix"
 host = "luasocket"
 
 function pass(...)
-    local s = string.format(unpack(arg))
+    local s = string.format(...)
     io.stderr:write(s, "\n")
 end
 
 function fail(...)
-    local s = string.format(unpack(arg))
+    local s = string.format(...)
     io.stderr:write("ERROR: ", s, "!\n")
 socket.sleep(3)
     os.exit()
 end
 
 function warn(...)
-    local s = string.format(unpack(arg))
+    local s = string.format(...)
     io.stderr:write("WARNING: ", s, "\n")
 end
 
 function remote(...)
-    local s = string.format(unpack(arg))
+    local s = string.format(...)
     s = string.gsub(s, "\n", ";")
     s = string.gsub(s, "%s+", " ")
     s = string.gsub(s, "^%s*", "")