* without passing env_vars to create_environment, GeneralizedPopen behavior is same as before fix to issue #1540 (803c3cb271) * env_vars allows explicit environment variables, per PR #1619 (f9183bbf64)
803c3cb271
f9183bbf64
* Extend this option to find_system_enviornments and get_system_environment without breaking API
* Attempt to send SYSTEMROOT variable to Windows subprocess