Can you name a single language that can talk to redis and doesn't have these in a form of a library that integrates with an app better than mystical embedded redis?
Every language you can talk to redis most likely has a library to do that, and it probably works much better with the rest of application than "embedded redis". If it doesn't, it probably has C-FFI and there is "fast, robust and well understood" implementations in C.
Sure. But if Redis was embeddable you'd get a robust C-FFI style implementation of those data structures which has been tested a lot more than some random library that has almost no existing users or active maintenance.
(I'm not personally sold on embedded Redis myself, but the question was "Aren’t your own programming language’s constructs much more well-defined / understood?")
> you'd get a robust C-FFI style implementation of those data structures which has been tested a lot more than some random library that has almost no existing users or active maintenance.
What are these mystical random libraries you're talking about? There is a solid C implementation of every data structure on this planet.
Why does it need to be pure C? There are C++ implementations. It's an algorithm not a social media app, it doesn't need to be updated once a week, C also not node.js - it doesn't break compatibility every release. What is wrong with these 10+ years touched ones?
Even the redis version of HLL isn't updated all that often.
That's exactly what I'm arguing for here: it would be useful if Redis data structures like that were available to be easily embedded in other programs.
"You can just adapt X from Redis" is the whole point of this hypothetical.
- HyperLogLog, bloom filter, other probabilistic data structures
- Geospatial operations on stored points and polygons
- Expiring keys, for creating caches
These aren't in most standard libraries, and the Redis implementations tend to be fast, robust and well understood.