Non integer blockSize causing byte(s) to be omitted from uploaded blobs.

[willavos]

• Package Name: storage-blob
• Package Version: 12.25.0
• Operating system: any
• [ ] nodejs
  • version: ? unknown
• [x] browser
  • name/version: chrome
• [x] typescript
  • version: 5.5.3
• Is the bug related to documentation in
  • [ ] README.md
  • [ ] source code documentation
  • [ ] SDK API docs on https://learn.microsoft.com

Describe the bug A non-integer blockSize in BlockBlobClient.uploadData causes bytes to be omitted (on chunk boundaries?) in the uploaded file. I suspect this is a rounding error!

To Reproduce Steps to reproduce the behavior:

1. Create a file with 1637734 bytes long:
   • cat /dev/random | head -c 1637734 > test-file
2. Try and upload 20 chunks, (blockSize = file size / 20 which is 81886.7)
3. Observe a missing byte halfway through.

Expected behavior To not omit the byte.

Screenshots N/A

Additional context I appreciate that this is a case of GIGO - but believe there should be a warming (at least) for poorly-conditioned blob block size / this should not result in missing byte.

[github-actions[bot]]

Thanks for the feedback! We are routing this to the appropriate team for follow-up. cc @xgithubtriage.