Update:
This problem appears to be resolved by a related TLDR: don’t use the ruby comes with mac.
See: xavi- commented on May 16, 2019
I followed his (xavi’s) instructions, switched to rbenv and bundle install worked, but still needs confirmation …
Update 2:
Confirmed: Switching to rbenv and setting up the current PATH environment ~/.rbenv/shims works and resolved this issue.
export PATH=~/.rbenv/shims:$PATH