False-positive initialization errors possible when opening multiple sessions simultaneously

[olets]

When multiple sessions are initializing at the same time, it's possible for the initializations to collide. Common symptoms are one terminal giving the error

util_add:source:45: no such file or directory: …/zsh-user-global-abbreviations

and another terminal giving for each user abbreviation the warning

abbr add: A matching abbreviation … already exists

These are false positives: in my testing, all sessions do end up with all the user abbreviations available.

Until this is addressed, users can work around it by letting one session load before opening another.

[olets]

Fixed in 3.0.1. Still theoretically possible, but I have successfully opened ten sessions "simultaneously" (iTerm, cmdd ten times in rapid succession)