Correct user id type from string to ArrayBuffer (compatible with BufferSource)

[segevmalool]

No description provided.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (8f6c8b0) 92.85% compared to head (398565f) 92.85%.

❗ Current head 398565f differs from pull request most recent head 751e761. Consider uploading reports for the commit 751e761 to get more accurate results

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Additional details and impacted files

@@           Coverage Diff           @@
##           master     #148   +/-   ##
=======================================
  Coverage   92.85%   92.85%           
=======================================
  Files          16       16           
  Lines        6019     6019           
=======================================
  Hits         5589     5589           
  Misses        430      430           

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