Release v0.40.1 libmdbx new version 0.14.2 "Stormy Petre" + bindings improved · erigontech/mdbx-go

libmdbx changes

A major frontward libmdbx release with new features, refactoring and many fixes. Highlights of full changelog

New features

Early GC Cleanup — recycled GC records are dropped as soon as possible instead of at commit, paving the way for explicit defragmentation and non-sequential GC processing.
Database defragmentation/compaction support and the new mdbx_defrag utility.
Massive range delete: mdbx_cursor_bunch_delete() and mdbx_cursor_delete_range() — drop adjacent items by excluding whole pages/branches from the B-tree.
New transaction primitives: mdbx_txn_refresh(), mdbx_txn_checkpoint(), mdbx_txn_commit_embark_read(), mdbx_txn_amend(), mdbx_txn_rollback(), mdbx_txn_clone(), plus support for nested read-only transactions.
Caching getters: mdbx_cache_get() / mdbx_cache_get_SingleThreaded().
GC introspection: mdbx_gc_info() for page usage and GC iteration.
Cursor scanning helpers: mdbx_cursor_distance(), mdbx_cursor_scroll(), mdbx_cursor_distribute().
MDBX_CP_OVERWRITE for copy API (mdbx_copy -f).
MDBX_opt_split_reserve to control page fullness on split.
Branchless search + inlined default comparators (faster lookups).
Page-fetch counters added to txn statistics (MDBX_ENABLE_PGET_STAT).
Harmony OS (OHOS) and Haiku OS support; libm dependency removed.

Behavior changes

Page merge threshold default raised from 25% → 33%.
Lock-acquire retry count tripled (fewer spurious EAGAIN on Android restart).
Windows builds now use the Win10 SDK by default.
MDBX_WANNA_RECOVERY no longer triggered when DB size is not a multiple of the VM allocation granularity (only when not a multiple of system page size).

Notable fixes

Critical fix in mdbx_env_resurrect_after_fork() with SysV semaphores (OSX/POSIX with MDBX_LOCKING=5) that could lead to DB corruption.
Copy API on non-Linux POSIX (mainly OSX) no longer returns spurious EAGAIN.
Fixes for unexpected MDBX_BAD_DBI, MDBX_DBS_FULL, SIGBUS on grown DB in nearly-full filesystems, TLS-destructor crashes, geometry auto-tuning regression, and more.

Note: upstream libmdbx repository has been relocated — sources at https://sourcecraft.dev/dqdkfa/libmdbx, docs at https://libmdbx.dqdkfa.ru.

New bindings / API

Expose ExactKeyValue / ExactKeyPair navigation flags ([#217](#217)).
Cursor.PutCurrent for in-place dup replacement in DupSort tables ([#207](#207)).
Bindings for range delete (cursor_delete_range / bunch delete) ([#201](#201)).
NoStickyThreads env option exposed ([#202](#202)).
EnvInfo.LatterReaderTxnID field added ([#204](#204)).

Metrics & observability

Performance & build