fix(assert): add support for checking ArrayBuffer equality

[lionel-rowe]

Fixes #6814

[lionel-rowe]

Honestly can't remember why I made this a proxy originally, it's just unnecessary complexity. Hope this tiny refactor is OK to include here and doesn't need its own PR

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.16%. Comparing base (2e717fd) to head (f12c527).
⚠️ Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6821      +/-   ##
==========================================
- Coverage   94.16%   94.16%   -0.01%     
==========================================
  Files         573      573              
  Lines       42393    42404      +11     
  Branches     6730     6734       +4     
==========================================
+ Hits        39921    39928       +7     
- Misses       2422     2425       +3     
- Partials       50       51       +1     

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[kt3k]

Confirmed this fixes the issue, and also the diff expression in the error message seems reasonable:

error: AssertionError: Values are not equal.


    [Diff] Actual / Expected


    ArrayBuffer {
-     [Uint8Contents]: <01 02 03>,
+     [Uint8Contents]: <02 02 04>,
      byteLength: 3,
    }

  throw new AssertionError(message);
        ^
    at assertEquals

LGTM