Avoid overgeneralized recursion

Per review from Maciek Sakrejda.
Typo

Per review from Maciek Sakrejda
Wordsmith

Per review from Maciek Sakrejda.
Remove environ-get duplicate

Per review from Maciek Sakrejda.
Fix another bad lexical version comparison

Per Maciek Sakrejda.
Comment wordsmithing

Per self-reflection.
Add south-asia region to built-in endpoint database

Per review of multi-region patch of Bo Shi, but useful regardless.
Add warning about failed region detection

Per review from Bo Shi