Make faster search on Finder::last() on SplFixedArray data

[samsonasik]

When data is SplFixedArray object, use ->toArray() instead of iterator_to_array().

Benchmark: SplFixedArray with 100000 elements
==================================================

Test 1: iterator_to_array()
  Average: 0.9139 ms
  Min: 0.8800 ms
  Max: 1.0941 ms

Test 2: SplFixedArray::toArray()
  Average: 0.3004 ms
  Min: 0.2842 ms
  Max: 0.3991 ms

==================================================
Comparison Results:
==================================================
iterator_to_array() is 204.27% slower
Speedup factor: 3.04x

Total time for 100 iterations:
  iterator_to_array(): 91.39 ms
  toArray(): 30.04 ms
  Difference: 61.35 ms

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (c45927f) to head (1111ff8).
⚠️ Report is 49 commits behind head on main.
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Additional details and impacted files

@@             Coverage Diff             @@
##                main       #34   +/-   ##
===========================================
  Coverage     100.00%   100.00%           
- Complexity        45        63   +18     
===========================================
  Files              4         5    +1     
  Lines            122       178   +56     
===========================================
+ Hits             122       178   +56     

Flag	Coverage Δ
tests	100.00% <100.00%> (ø)

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