--- a/util/array.lua	Fri Dec 09 11:57:14 2011 +0500
+++ b/util/array.lua	Fri Dec 09 12:02:21 2011 +0500
@@ -9,6 +9,11 @@
 local t_insert, t_sort, t_remove, t_concat
     = table.insert, table.sort, table.remove, table.concat;
 
+local setmetatable = setmetatable;
+local math_random = math.random;
+local pairs, ipairs = pairs, ipairs;
+local tostring = tostring;
+
 local array = {};
 local array_base = {};
 local array_methods = {};
@@ -27,7 +32,7 @@
 
 -- Read-only methods
 function array_methods:random()
-	return self[math.random(1,#self)];
+	return self[math_random(1,#self)];
 end
 
 -- These methods can be called two ways:
@@ -80,7 +85,7 @@
 function array_methods:shuffle(outa, ina)
 	local len = #self;
 	for i=1,#self do
-		local r = math.random(i,len);
+		local r = math_random(i,len);
 		self[i], self[r] = self[r], self[i];
 	end
 	return self;
@@ -104,18 +109,18 @@
 end
 
 function array_methods:push(x)
-	table.insert(self, x);
+	t_insert(self, x);
 	return self;
 end
 
 function array_methods:pop(x)
 	local v = self[x];
-	table.remove(self, x);
+	t_remove(self, x);
 	return v;
 end
 
 function array_methods:concat(sep)
-	return table.concat(array.map(self, tostring), sep);
+	return t_concat(array.map(self, tostring), sep);
 end
 
 function array_methods:length()
@@ -128,7 +133,7 @@
 	while true do
 		var = f(s, var);
 	        if var == nil then break; end
-		table.insert(t, var);
+		t_insert(t, var);
 	end
 	return setmetatable(t, array_mt);
 end