v1.2.13
* BUG: Fixed WAL integration for updates in IWDB_DUP_UINT32_VALS|IWDB_DUP_UINT64_VALS mode * Store arbitrary data blocks associated with iwkv internal databases (#12) * Checking of max key/value size (IWKV_MAX_KVSZ) for updates in IWDB_DUP_UINT32_VALS|IWDB_DUP_UINT64_VALS mode * Minor allocation performance optimizations in _kvblk_addkv()