[droundy]

Summary

container.rs (used by Intern), append_container.rs (Intern32) and typearena.rs (NewIntern) each contained an identical ~35-line hash_of_type function with its own HasherForTypeId, plus their own 32 constant for the number of buckets. This moves both into a new src/type_bucket.rs:

• TYPE_BUCKETS: the number of buckets (32), now defined once;
• type_bucket::<T>(): which bucket holds T's container (the old hash, taken modulo TYPE_BUCKETS).

The callers shrink to self.containers[type_bucket::<T>()]. Net: −132/+23 lines in the existing files, plus the new 50-line module (including a small test).

Behaviour

Unchanged. The hasher and the arithmetic are the same, and each caller hashes the same type as before. In particular typearena.rs hashed Mutex<HashSet<T>> rather than T, and still does (type_bucket::<Mutex<HashSet<T>>>()), so every type lands in the same bucket.

Test plan

• cargo test --all-features -- --test-threads=1 and cargo test
• cargo check with default features, --features _experimental-new-intern, --features arc,tinyset, --no-default-features --features arc, --all-features; no new warnings or errors (the existing ones, e.g. --features intern32 without deepsize, are fixed separately in Move the benchmarks to scaling 0.9, and compare with the previous release #66)
• cargo +1.71.0 check --all-features

Independent of #66; based on master.

🤖 Generated with Claude Code

[codecov]

Codecov Report

❌ Patch coverage is 82.14286% with 5 lines in your changes missing coverage. Please review.
✅ Project coverage is 79.51%. Comparing base (49dd84c) to head (3f455a8).

Files with missing lines	Patch %	Lines
src/type_bucket.rs	76.19%	5 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #67      +/-   ##
==========================================
- Coverage   80.17%   79.51%   -0.67%     
==========================================
  Files          10       11       +1     
  Lines        2068     1884     -184     
==========================================
- Hits         1658     1498     -160     
+ Misses        410      386      -24     

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