JIT compiling Ruby or Python in a way that speeds up code using existing libraries and frameworks is harder. We built up decades of code that does stuff that it would be a lot easier for JIT performance if we didn't do, like using C extensions instead of defined FFI.

https://arxiv.org/html/2609.01502v1

If it works for you it’s great but the RDS EBS limitations are real enough… AWS built Aurora and for RDS a new 3 node topology using local SSDs for writes and EBS only for the data directly.

Most companies can afford not to give a shit until they hit SOC2 or GDPR compliance and then suddenly orphaned data is a giant liability.

Does vacuum not release free pages at the end of an index file in the same way it does for the heap?

No, it does not

> hybrid OLAP+OLTP .... in Postgres this pattern requires careful planning to avoid falling afoul of max_standby_streaming_delay for example

This is a really gnarly problem at scale I've rarely seen anyone else bring up. Either you use max_standby_streaming_delay and queries that conflict with replication cause replication to lag or you use hot_standby_feedback and long running queries on the OLAP replica cause problems on the primary.

Logical Decoding on a replica in also needs hot standby feedback which is a giant PITA for your ETL replica.

Make friends with lawyers.

Purely vibes but as a Kiwi I feel like Number 8 Wire mentality has been dead for at least 20 years now.

Symbols have been GCed since CRuby 2.2 https://bugs.ruby-lang.org/issues/9634

Well thats great, guess I have carried that baggage with me as misinformation for years now.

One of the things I’ve said I would do and never did is create a set of test suites for as many facts about a language as I know and then run it for every new release to see what I need to unlearn.

Most but not all of these were performance related. If it took a few days to run that’s fine. Major versions don’t come out that often.

Same here. Turns out writing too much code for RPG Maker XP when young ruins one’s perception of Ruby forever

Can we demonstrate them doing that? Absolutely.

Will they fail to do it in practice once they poison their own context hallucinating libraries or functions that don’t exist? Absolutely.

That’s the tricky part of working with agents.

Hallucinations are now plausibly wrong which is in some ways harder to deal with. GPT4.1 still generates Rust with imaginary crates and says “your tests passed, we can now move on” to a completely failed test run.