Support Traversable keys in loadMany

[simPod]

Summary

• Materialize Traversable input before mapping loads.
• Preserve iteration order and repeated iterator keys.

Motivation

loadMany() accepts Traversable, but passed it directly to array_map(), which only accepts arrays.

[codecov-commenter]

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 60.27%. Comparing base (3a6d9a0) to head (6363e9b).
⚠️ Report is 7 commits behind head on master.
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Additional details and impacted files

@@            Coverage Diff             @@
##           master      #79      +/-   ##
==========================================
+ Coverage   59.14%   60.27%   +1.13%     
==========================================
  Files           7        7              
  Lines         350      360      +10     
==========================================
+ Hits          207      217      +10     
  Misses        143      143              

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[mcg-web]

Can you fix this conflict please @simPod ?

[simPod]

Done

[simPod]

Maybe we can address this

[mcg-web]

I'm on it, thanks again !