After reading [this blog
post](https://blog.rubygems.org/2011/08/31/shaving-the-yaml-yak.html),
published almost 10 years ago already, my understanding is that this
problem could come up in two ways:
* Rubygems.org serving corrupted gemspecs". As far as I understand this
was fixed in rubygems.org a lot time ago, since
https://github.com/rubygems/rubygems.org/pull/331.
* Clients having a ten years old gemspec cache with some of these bad
gemspecs. In this case, there's no easy solution but I think ten years
is enough and rebuilding the cache should do the trick.
So, I think it's time we remove this.
https://github.com/rubygems/rubygems/commit/afcb15d556