iemejia commented on PR #3861:
URL: https://github.com/apache/avro/pull/3861#issuecomment-4952729964

   **Preallocation (AVRO-4292 follow-up) evaluated — no change needed here.** 
`read_array`/`read_map` build `read_items`/the dict via `.append()`, growing on 
demand rather than preallocating to the declared block count, so there is no 
up-front over-allocation to bound (unlike the Java/C++/C# readers, which sized 
a buffer to the count). The existing structural and zero-byte caps already 
bound the growth.


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