✨ made async stream cancelled correctly

[XyLearningProgramming]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 94.11765% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 91.38%. Comparing base (bc8d868) to head (61eec99).
⚠️ Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
slm_server/utils/spans.py	81.81%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main       #8      +/-   ##
==========================================
- Coverage   92.61%   91.38%   -1.23%     
==========================================
  Files          12       12              
  Lines         609      615       +6     
==========================================
- Hits          564      562       -2     
- Misses         45       53       +8     

Flag	Coverage Δ
unittests	91.38% <94.11%> (-1.23%)	⬇️

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