dialects: (stream) simplify constr helper on stream attributes

[superlopuh]

Trying #3473 again

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.33%. Comparing base (afa862d) to head (06ff0db).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3494      +/-   ##
==========================================
+ Coverage   90.32%   90.33%   +0.01%     
==========================================
  Files         464      464              
  Lines       58079    58057      -22     
  Branches     5565     5556       -9     
==========================================
- Hits        52458    52446      -12     
+ Misses       4188     4185       -3     
+ Partials     1433     1426       -7     

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