Fix byte-length validation for memoryviews

[Shubham-Padkonde]

The Bytes validator accepts memoryviews but checks len(value), which counts elements (or the first dimension) rather than bytes. An eight-byte view cast to two integers is consequently reported as two bytes: valid minimum lengths fail, and maximum lengths can be exceeded.

Use memoryview.nbytes for memoryviews while retaining len() for bytes. The original value is returned unchanged. Regression tests cover typed and multidimensional views, including the length in the validation error.

Validation: all 191 tests pass on Linux. Both new regressions fail before the fix. Changed-file Flake8 and git diff --check pass. The Windows run passes 189 tests and fails two platform-sensitive tests (temporary-file reopening and whitespace parsing); both pass on Linux.

[CLAassistant]

All committers have signed the CLA.

[ineil-dbx]

Hi @Shubham-Padkonde, I’ve raised this with our engineering team for further review. They’ll be able to review the pull request and address it as appropriate.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 52.36%. Comparing base (1ad079b) to head (c4330c6).
⚠️ Report is 38 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #395      +/-   ##
==========================================
+ Coverage   49.98%   52.36%   +2.37%     
==========================================
  Files          37       42       +5     
  Lines        8808    11452    +2644     
  Branches     1892     2393     +501     
==========================================
+ Hits         4403     5997    +1594     
- Misses       4087     4922     +835     
- Partials      318      533     +215     

Flag	Coverage Δ
unit	52.36% <100.00%> (+2.37%)	⬆️

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