Unexpected behaviour: elt(T) doesn't raise out-of range error about itensor HOT 5 OPEN

auto i = Index(2);
auto j = Index(2);
auto T = randomITensor(i, j);
std::cout << "Here is the output: " << elt(T, 10, 10) << std::endl;

root@2d7b272ef1f7:/home/tests# gdb -ex 'run' ./build/test.exe             
GNU gdb (Debian 10.1-1.7) 10.1.90.20210103-git
Copyright (C) 2021 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.
Type "show copying" and "show warranty" for details.
This GDB was configured as "x86_64-linux-gnu".
Type "show configuration" for configuration details.
For bug reporting instructions, please see:
<https://www.gnu.org/software/gdb/bugs/>.
Find the GDB manual and other documentation resources online at:
    <http://www.gnu.org/software/gdb/documentation/>.

For help, type "help".
Type "apropos word" to search for commands related to "word"...
Reading symbols from ./build/test.exe...
Starting program: /home/tests/build/test.exe 
warning: Error disabling address space randomization: Operation not permitted
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
warning: File "/usr/local/lib64/libstdc++.so.6.0.30-gdb.py" auto-loading has been declined by your `auto-load safe-path' set to "$debugdir:$datadir/auto-load".
To enable execution of this file add
        add-auto-load-safe-path /usr/local/lib64/libstdc++.so.6.0.30-gdb.py
--Type <RET> for more, q to quit, c to continue without paging--c
line to your configuration file "/root/.gdbinit".
To completely disable this security protection add
        set auto-load safe-path /
line to your configuration file "/root/.gdbinit".
For more information about this security protection see the
"Auto-loading safe path" section in the GDB manual.  E.g., run from the shell:
        info "(gdb)Auto-loading safe path"
[New Thread 0x7fd605e56700 (LWP 135)]
[New Thread 0x7fd605655700 (LWP 136)]
[New Thread 0x7fd5fce54700 (LWP 137)]
Here is the output: 0
===============================================================================
test cases: 1 | 1 passed
assertions: - none -

[Thread 0x7fd605655700 (LWP 136) exited]
[Thread 0x7fd5fce54700 (LWP 137) exited]
[Thread 0x7fd605e56700 (LWP 135) exited]
[Inferior 1 (process 131) exited normally]

#include <catch2/catch_all.hpp>
#include <catch2/catch_test_macros.hpp>
#include "itensor/all.h"
using namespace itensor;

TEST_CASE("Test behaviour of elt(T) func", "[TestFuncElt]") {
  auto i = Index(2);
  auto j = Index(2);
  auto T = randomITensor(i, j);
  for (int k = 3; k < 20; ++k) {
    // always gives zero or infinity for out-of-range index?
    CHECK(((elt(T, k, k) < std::numeric_limits<float>::min()) ||
           (elt(T, k, k) > std::numeric_limits<float>::max())));
  }
}

root@2d7b272ef1f7:/home/tests# ./build/test.exe [TestFuncElt]
Filters: [TestFuncElt]
===============================================================================
All tests passed (17 assertions in 1 test case)