On 4/11/2021 3:51 PM, Jason R. Coombs wrote:
 > Jason R. Coombs <jaraco@jaraco.com> added the comment:
 >
 > At least I and Ethan and Martin have expressed a desire for the 
default, preferred usage work well in a portable environment. Requiring 
`delete_on_close=False` violates that expectation.

My opinion is that no extra flags are necessary.  The default of 
deleting on close is fine, unless a context manager is active -- in 
which case delete on CM exit.  Note that an internal flag will be needed 
to track the status of being in a context manager, but nothing besides 
behavior in that edge case would change.