lua: preallocate tables with appropriate capacities

common/geodata/lua.go

@@ -23,7 +23,7 @@ var (
 // RegisterLua makes xray.geodata available to require in an LState.
 func RegisterLua(L *lua.LState) {
 	L.PreloadModule("xray.geodata", func(L *lua.LState) int {
-		module := L.NewTable()
+		module := L.CreateTable(0, 2)
 
 		module.RawSetString("BuildDomainMatcher", L.NewFunction(func(L *lua.LState) int {
 			parsed, err := ParseDomainRules(luaRules(L), Domain_Domain)

common/log/lua.go

@@ -10,7 +10,7 @@ import (
 // RegisterLua makes xray.log available to require in an LState.
 func RegisterLua(L *lua.LState) {
 	L.PreloadModule("xray.log", func(L *lua.LState) int {
-		module := L.NewTable()
+		module := L.CreateTable(0, 4)
 		var source, prefix string // cache
 		for name, severity := range map[string]Severity{
 			"Debug":   Severity_Debug,