Solve issue with objc[18501]: +[__NSCFConstantString initialize] may have been in progress in another thread when fork() was called.

fix_NSCFConstantString_initialize.txt

# If you have issue with 
# objc[18501]: +[__NSCFConstantString initialize] may have been in progress in another thread when fork() was called.
# objc[18501]: +[__NSCFConstantString initialize] may have been in progress in another thread when fork() was called. We cannot safely call it or ignore it in the fork() child process. Crashing instead. Set a breakpoint on objc_initializeAfterForkError to debug.

# I had this problem when running `bin/rails c` on Mac M1 Pro. The solution for this is below

$ export OBJC_DISABLE_INITIALIZE_FORK_SAFETY=YES
$ export DISABLE_SPRING=true

This should help.

See more here: rails/rails#38560