Github user danielsun1106 commented on the pull request:
https://github.com/apache/groovy/commit/ec7b147b4b90c55e1d117f3bac63b060eeb79386#commitcomment-30043824
`UnlimitedConcurrentCache`'s `getAndPut` on 2.5 branch is not thread safe,
so the commit is only for the master.---
