Fix space leak: repeated attach/detach on long-lived threads no longer
accumulates Weak# objects. Detach marks the slot key with a flag bit
instead of tombstoning, so re-attach reuses the slot without registering
a duplicate GC finalizer.
Fibonacci multiplicative hash for slot assignment spreads sequential
thread IDs across cache lines, reducing false sharing under multi-core
contention.
Detach no longer writes to the GC-traced value array, eliminating
card-table contention on the detach path.
Hot-path lookup/adjust/lookupRefFast no longer check for detached
markers in the value array; the CMM probe reports detach status directly.
0.4.0.0
Replace striped-IntMap internals with a flat open-addressed hash table
backed by per-thread IORefs. Reads and writes on the hot path are now
plain IORef operations, with zero CAS and zero contention.
Add CMM primops (stg_getCurrentThreadId, stg_probeThreadSlot,
stg_probeSlotByKey) to eliminate ThreadId allocation and FFI overhead
on the hot path.
New construction function: newThreadStorageMapWith for explicit capacity.
New getCurrentThreadId reads CurrentTSO.id directly via CMM.
New ref-based API for instrumentation hot loops: ensureRef,
ensureRefFast, lookupRef, lookupRefFast, readRef, writeRef,
modifyRef.
Remove containers dependency.
Requires cabal-version: 3.0 (for cmm-sources).
Backwards compatible: all previously exported symbols retain their
original type signatures.
