iemejia commented on PR #3845:
URL: https://github.com/apache/avro/pull/3845#issuecomment-4946221003

   Pushed a small hardening follow-up (eb6a031b2f): `read_map` now tracks a 
running pair count instead of `len(read_items)` for the cumulative check. 
Repeated keys collapse in the dict, so counting dict size would let a stream 
that keeps rewriting the same key bypass the configured maximum. This mirrors 
the same fix applied to the PHP and Perl decoders after review. Added 
`test_map_cumulative_limit_with_repeated_keys`.


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