v2.0.0-beta.8 - 2026/07/27

Added

• Added Config option to disallow running the start function of Wasm modules. #1985
• Added some more optimizations to Wasmi:
  • Greatly improved speed for accessing instance related objects in the executor. #1940
    • This optimization builds on a new improved internal Wasm instance layout + caching.
  • Improve performance of call_imported and call_indirect via caching. #1996
  • Improve performance for accessing instance related objects on 32-bit platforms. #1997
  • Resolve deduplicated function types at translation time to improve call_indirect performance. #2006
  • All in all the count/globals benchmark saw a whopping ~35% improvement in performance.
    • Despite Wasmi's module related bytecode, instance access is now as efficient as in Wasm3's
      or Stitch'es executors with their instance-related bytecodes.

Fixed

• Fix potential memory invadliation bug when tail calling host functions. #1999

Internal

• Added benchmark to test call_indirect performance. #1993
• Added benchmark to test call_imported performance for non-host calls. #1994
• Added Stable{Arena,Vec} to wasmi_collections. #1987
  • These new collections are similar to Arena and Vec respectively
    but with stable internal pointers to their contained items.
  • These collections were required to implement #1940.