Minor cleanup of internals.

[jorgecarleitao]

No description provided.

[codecov]

Codecov Report

Merging #456 (b1f291a) into main (39caeb3) will increase coverage by 0.02%.
The diff coverage is 81.25%.

@@            Coverage Diff             @@
##             main     #456      +/-   ##
==========================================
+ Coverage   79.87%   79.90%   +0.02%     
==========================================
  Files         371      371              
  Lines       22753    22754       +1     
==========================================
+ Hits        18175    18181       +6     
+ Misses       4578     4573       -5     

Impacted Files	Coverage Δ
src/array/mod.rs	54.62% <ø> (ø)
src/array/list/mod.rs	72.09% <66.66%> (+2.32%)	⬆️
src/array/fixed_size_list/mod.rs	54.28% <85.71%> (+2.85%)	⬆️
src/array/fixed_size_binary/mod.rs	46.05% <100.00%> (+0.71%)	⬆️
src/io/avro/read/schema.rs	42.52% <0.00%> (+1.14%)	⬆️

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