Allow the stamping visitor itself to set the stamp value type instead of casting it to a list

[Nusnus]

No description provided.

[codecov]

Codecov Report

Base: 89.89% // Head: 89.89% // No change to project coverage 👍

Coverage data is based on head (6c89591) compared to base (577eee6).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #7914   +/-   ##
=======================================
  Coverage   89.89%   89.89%           
=======================================
  Files         128      128           
  Lines       15896    15896           
  Branches     2140     2140           
=======================================
  Hits        14290    14290           
  Misses       1370     1370           
  Partials      236      236           

Flag	Coverage Δ
unittests	89.87% <100.00%> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
celery/app/amqp.py	94.78% <100.00%> (ø)

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[auvipy]

tests are passing

[Nusnus]

I forgot to click Ready for Review 😅