v2.0.0-beta.5 - 2026/07/06

Added

• Reduced Wasmi's binary artifact size with some new features and tweaks:
  • Minor tweaks: #1960
  • Added a new debug crate feature to Wasmi. #1959
    • This is useful if richer debug messages are required.
    • Disabled by default to reduce Wasmi's binary artifact size by default.
  • Replace generic monomorphization with explicit V-Tables in translation. #1961
• Added fused load+copy_sr operators. #1955
  • These improve performance by up to 10% according to some benchmark test cases.
• Added richer error information to Wasm module instantiation errors. #1962 + #1963
  • Thanks to kajacx for the improvement!

Fixed

• Fixed a u64 overflow when sizing a 64-bit memory's maximum during translation. #1964
  • A memory64 declared with the largest allowed maximum (2^48 pages) turned every
    non-zero constant load/store address into an unconditional MemoryOutOfBounds trap.
  • Thanks to aizu-m for the fix!
• Fixed mismatched load_extend translation and execution. #1958
  • Funnily this was mismatched on both translation and execution which caused this
    to slip under the CI's radar as the double breakage caused this to behave as intended.

Changed

• Lower some v128_load{32,64}_lane operators to extract_lane + scalar.store operators. #1966

Internal

• Clean-up execution handlers with the new Args utility type. #1956