v0.10.0

Added

• macOS process GC (the headline): -Dgc_none + require "gcry" is a real collector on Darwin (arm64 + x86_64), Crystal ≥ 1.21 — not stubs.
  • STW: Mach thread_suspend / thread_resume (signal STW under HTTP was ~hang / ~2 req/s)
  • SP clamp: thread_get_state + pthread_get_stackaddr_np stack bounds
  • Static roots: dyld main-image __DATA / __DATA_CONST (__data / __bss / __common; skip __const)
  • Free-page RSS: host-page mach_vm_deallocate + allocate(FIXED) (Apple Silicon 16 KiB; MADV_DONTNEED does not drop Darwin RSS)
  • Defaults: page blacklist off (opt-in GCRY_BLACKLIST=1); large_cache_retain 0
  • CI: macos-latest native specs + samples
• Gcry.register_set(T) — registers Hash(T, Nil) for Set backing maps.
• GCRY_SCAN_CAPS=1 — optional whole-program instance_sizeof scan caps (fat-app live set often unchanged).

Changed

• Layout builtins: broader curated coverage — primitive/String arrays, Set-backing hashes, Hash/Array + JSON::Any, IO::Memory (noscan buffer), more Deques. Still not whole-program GCRY_AUTO_LAYOUTS.
• Layout correctness: Pointer(T) noscan uses !T.has_inner_pointers? (safe for Array(JSON::Any)). Hash keys/values with inner pointers word-scanned.
• Mark: size-class mismatch falls back to scan_cap when present; precise entries store instance_sizeof.
• Large objects: mmap aligned to Platform.host_page_size; LARGE_CACHE_LIMIT hard-caps freelist retain.
• Blacklist: page granularity uses host_page_size.
• Docs: Linux vs Darwin PERF / ACIKTURKIYE split; README highlights macOS.

Performance

• macOS Kemal (0.10.0 cut, Apple Silicon, median of 3, scrub off): / ~97% of Boehm; /json ~90%; post-GC RSS ~0.96–0.97× — see docs/PERF-macos.md.
• macOS acikturkiye /api/v1/ (median of 3): thr trial-median ~80%; post-GC RSS ~11.8× (dense conservative-live; reclaim works) — see docs/ACIKTURKIYE-macos.md.
• Linux Kemal / acikturkiye cut numbers unchanged from 0.9.0 (this host is Darwin; re-record on Linux before citing a new Linux cut) — docs/PERF.md, docs/ACIKTURKIYE.md.