io.write discards spaces after trailing numbers

[spakin]

Consider this Lua code:

io.write("123 ")
io.write("456 ")
io.write("Hello, ")
io.write("world!\n")

This does what it's supposed to when run with the standard Lua interpreter:

$ lua5.3
Lua 5.3.3  Copyright (C) 1994-2016 Lua.org, PUC-Rio
> dofile("bad-format.lua")
123 456 Hello, world!
> 

Now run the code using go-lua:

package main

import "github.com/Shopify/go-lua"
import "os"

func main() {
	l := lua.NewState()
	lua.OpenLibraries(l)
	if err := lua.DoFile(l, os.Args[1]); err != nil {
		panic(err)
	}
}

The space following each number mysteriously disappears:

$ go run bad-format.go bad-format.lua
123456Hello, world!