Why initial top is 1, not 0?

[dayo05]

val lua = LuaJit()

assertEquals(1, lua.top) // why??
    
for((a, b) in lua.get().entries)
    println(a.toJavaObject().toString() + " " + b.toJavaObject())

I made simple example of instance creation, lua.top returns 1 even LuaJit instance just constructed.

What is it?

the for loop prints:

__gc RefLuaValue$FUNCTION@party.iroiro.luajava.luajit.LuaJit@1169afe1:3
__eq RefLuaValue$FUNCTION@party.iroiro.luajava.luajit.LuaJit@1169afe1:5
__len RefLuaValue$FUNCTION@party.iroiro.luajava.luajit.LuaJit@1169afe1:7
__index RefLuaValue$FUNCTION@party.iroiro.luajava.luajit.LuaJit@1169afe1:9
__newindex RefLuaValue$FUNCTION@party.iroiro.luajava.luajit.LuaJit@1169afe1:11

[dayo05]

And also, can I just pop it?

[gudzpoz]

The value(s) on stack are unintended remains of Lua library initialization and should be safe to remove.
However, leaving the stack empty might trigger a bug I just found: LuaValue::size seemed to pop an extra item off the stack, which has been fixed by a new v4.0.1 version.