Tables with Longs as Keys eating RAM

[Max De Marzi <maxdemarzi@...>]

The code below runs just fine on both of these online Lua websites.

https://www.lua.org/cgi-bin/demo 
https://luajit.me/

local tab = {} 

tab[938388893] = "hi" 

tab[987383332] = "Hello"

for k,v in pairs(tab) do

 print(k) 

print (v) 

end

But when I try it using the Sol2 library (embedded in C++) it eats all my memory. 

It seems to create a giant table with the array part full of mostly empty values and just those two strings in their corresponding array slots.

Is it a Sol2 issue or a C Lua binding issue? Anybody know?