v0.9.x (in the development):
  - TODO: API for explicit threads (de)registration.
  - TODO: Native bindings for C++.
  - TODO: Packages for AltLinux, Fedora/RHEL, Debian/Ubuntu.

v0.8.2 2020-07-06:
  - Added support multi-opening the same DB in a process with SysV locking (BSD).
  - Fixed warnings & minors for LCC compiler (E2K).
  - Enabled to simultaneously open the same database from processes with and without the `MDBX_WRITEMAP` option.
  - Added key-to-value, `mdbx_get_keycmp()` and `mdbx_get_datacmp()` functions (helpful to avoid using custom comparators).
  - Added `ENABLE_UBSAN` CMake option to enabling the UndefinedBehaviorSanitizer from GCC/CLANG.
  - Workaround for CLANG bug https://bugs.llvm.org/show_bug.cgi?id=43275.
  - Returning MDBX_CORRUPTED in case all meta-pages are weak and no other error.
  - Refined mode bits while auto-creating LCK-file.
  - Avoids unnecessary database file re-mapping in case geometry changed by another process(es).
    From the user's point of view, the MDBX_UNABLE_EXTEND_MAPSIZE error will now be returned less frequently and only when using the DB in the current process really requires it to be reopened.
  - Remapping on-the-fly and of the database file was implemented.
    Now remapping with a change of address is performed automatically if there are no dependent readers in the current process.

v0.8.1 2020-06-12:
  - Minor change versioning. The last number in the version now means the number of commits since last release/tag.
  - Provide ChangeLog file.
  - Fix for using libmdbx as a C-only sub-project with CMake.
  - Fix `mdbx_env_set_geometry()` for case it is called from an opened environment outside of a write transaction.
  - Add support for huge transactions and `MDBX_HUGE_TRANSACTIONS` build-option (default `OFF`).
  - Refine LTO (link time optimization) for clang.
  - Force enabling exceptions handling for MSVC (`/EHsc` option).

v0.8.0 2020-06-05:
  - Support for Android/Bionic.
  - Support for iOS.
  - Auto-handling `MDBX_NOSUBDIR` while opening for any existing database.
  - Engage github-actions to make release-assets.
  - Clarify API description.
  - Extended keygen-cases in stochastic test.
  - Fix fetching of first/lower key from LEAF2-page during page merge.
  - Fix missing comma in array of error messages.
  - Fix div-by-zero while copy-with-compaction for non-resizable environments.
  - Fixes & enhancements for custom-comparators.
  - Fix `MDBX_AVOID_CRT` option and missing `ntdll.def`.
  - Fix `mdbx_env_close()` to work correctly called concurrently from several threads.
  - Fix null-deref in an ASAN-enabled builds while opening the environment with error and/or read-only.
  - Fix AddressSanitizer errors after closing the environment.
  - Fix/workaround to avoid GCC 10.x pedantic warnings.
  - Fix using `ENODATA` for FreeBSD.
  - Avoid invalidation of DBI-handle(s) when it just closes.
  - Avoid using `pwritev()` for single-writes (up to 10% speedup for some kernels & scenarios).
  - Avoiding `MDBX_UTTERLY_NOSYNC` as result of flags merge.
  - Add `mdbx_dbi_dupsort_depthmask()` function.
  - Add `MDBX_CP_FORCE_RESIZEABLE` option.
  - Add deprecated `MDBX_MAP_RESIZED` for compatibility.
  - Add `MDBX_BUILD_TOOLS` option (default `ON`).
  - Refine `mdbx_dbi_open_ex()` to safe concurrently opening the same handle from different threads.
  - Truncate clk-file during environment closing. So a zero-length lck-file indicates that the environment was closed properly.
  - Refine `mdbx_update_gc()` for huge transactions with small sizes of database page.
  - Extends dump/load to support all MDBX attributes.
  - Avoid upsertion the same key-value data, fix related assertions.
  - Rework min/max length checking for keys & values.
  - Checking the order of keys on all pages during checking.
  - Support `CFLAGS_EXTRA` make-option for convenience.
  - Preserve the last txnid while copying with compactification.
  - Auto-reset running transaction in mdbx_txn_renew().
  - Automatically abort errored transaction in mdbx_txn_commit().
  - Auto-choose page size for large databases.
  - Rearrange source files, rework build, options-support by CMake.
  - Crutch for WSL1 (Windows subsystem for Linux).
  - Refine install/uninstall targets.
  - Support for Valgrind 3.14 and later.
  - Add check-analyzer check-ubsan check-asan check-leak targets to Makefile.
  - Minor fix/workaround to avoid UBSAN traps for `memcpy(ptr, NULL, 0)`.
  - Avoid some GCC-analyzer false-positive warnings.

v0.7.0 2020-03-18:
  - Workarounds for Wine (Windows compatibility layer for Linux).
  - `MDBX_MAP_RESIZED` renamed to `MDBX_UNABLE_EXTEND_MAPSIZE`.
  - Clarify API description, fix typos.
  - Speedup runtime checks in debug/checked builds.
  - Added checking for read/write transactions overlapping for the same thread, added `MDBX_TXN_OVERLAPPING` error and `MDBX_DBG_LEGACY_OVERLAP` option.
  - Added `mdbx_key_from_jsonInteger()`, `mdbx_key_from_double()`, `mdbx_key_from_float()`, `mdbx_key_from_int64()` and `mdbx_key_from_int32()` functions. See `mdbx.h` for description.
  - Fix compatibility (use zero for invalid DBI).
  - Refine/clarify error messages.
  - Avoids extra error messages "bad txn" from mdbx_chk when DB is corrupted.

v0.6.0 2020-01-21:
  - Fix `mdbx_load` utility for custom comparators.
  - Fix checks related to `MDBX_APPEND` flag inside `mdbx_cursor_put()`.
  - Refine/fix dbi_bind() internals.
  - Refine/fix handling STATUS_CONFLICTING_ADDRESSES.
  - Rework `MDBX_DBG_DUMP` option to avoid disk I/O performance degradation.
  - Add built-in help to test tool.
  - Fix `mdbx_env_set_geometry()` for large page size.
  - Fix env_set_geometry() for large pagesize.
  - Clarify API description & comments, fix typos.

v0.5.0 2019-12-31:
  - Fix returning MDBX_RESULT_TRUE from page_alloc().
  - Fix false-positive ASAN issue.
  - Fix assertion for `MDBX_NOTLS` option.
  - Rework MADV_DONTNEED threshold.
  - Fix `mdbx_chk` utility for don't checking some numbers if walking on the B-tree was disabled.
  - Use page's mp_txnid for basic integrity checking.
  - Add MDBX_FORCE_ASSERTIONS built-time option.
  - Rework MDBX_DBG_DUMP to avoid performance degradation.
  - Rename MDBX_NOSYNC to MDBX_SAFE_NOSYNC for clarity.
  - Interpret `ERROR_ACCESS_DENIED` from `OpenProcess()` as 'process exists'.
  - Avoid using FILE_FLAG_NO_BUFFERING for compatibility with small database pages.
  - Added install section for CMake.

v0.4.0 2019-12-02:
  - Support for Mac OSX, FreeBSD, NetBSD, OpenBSD, DragonFly BSD, OpenSolaris, OpenIndiana (AIX and HP-UX pending).
  - Use bootid for decisions of rollback.
  - Counting retired pages and extended transaction info.
  - Add MDBX_ACCEDE flag for database opening.
  - Using OFD-locks and tracking for in-process multi-opening.
  - Hot backup into pipe.
  - Support for cmake & amalgamated sources.
  - Fastest internal sort implementation.
  - New internal dirty-list implementation with lazy sorting.
  - Support for lazy-sync-to-disk with polling.
  - Extended key length.
  - Last update transaction number for each sub-database.
  - Automatic read ahead enabling/disabling.
  - More auto-compactification.
  - Using -fsanitize=undefined and -Wpedantic options.
  - Rework page merging.
  - Nested transactions.
  - API description.
  - Checking for non-local filesystems to avoid DB corruption.