Automated testing for > 4 GiB

[SteveLasker]

Issue #135 for test 27 surfaced some questions around memory size constraints of github actions.

Options:

1. Should manual coverage be done outside of github actions?
2. Should we do manual testing before we cut a release? Manual testing on a release would leave interim builds as a weak link as we know projects take dependencies on interim builds.
3. The other option would be to enforce a hard limit in the library on 4 GiB until we get automation in place.
4. Should we document the currently tested constraints?

@roywill will take the action item for running automated tests on larger machines.

[SteveLasker]

Closing as stale. Happy to see additional test coverage if someone is blocked or interested in adding more coverage.