stevenzwu commented on code in PR #18416:
URL: https://github.com/apache/iceberg/pull/18416#discussion_r4214217669


##########
format/spec.md:
##########
@@ -1896,6 +1910,8 @@ The binary single-value serialization can be used to 
store the lower and upper b
 
 ### Version 4
 
+The `vector` type is added in v4. Writing `vector` into a v3 or earlier schema 
is invalid.

Review Comment:
   this seems unnecessary. I don't think we say this for the new types 
introduced in v3.
   ```
   Writing `vector` into a v3 or earlier schema is invalid.
   ```



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