Rename to unsafe when a function returns an alias

[blegat]

This might create nasty bugs so it's better to warn

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.36%. Comparing base (2e494c1) to head (a10a8a4).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #55   +/-   ##
=======================================
  Coverage   99.36%   99.36%           
=======================================
  Files          26       26           
  Lines        1259     1260    +1     
=======================================
+ Hits         1251     1252    +1     
  Misses          8        8           

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