alamb commented on code in PR #6620:
URL: https://github.com/apache/arrow-rs/pull/6620#discussion_r1819192249


##########
arrow-array/src/cast.rs:
##########
@@ -21,6 +21,11 @@ use crate::array::*;
 use crate::types::*;
 use arrow_data::ArrayData;
 
+#[doc(hidden)]
+pub mod __private {

Review Comment:
   Some context might be nice:
   
   ```suggestion
   /// Re-export symbols needed for downcast macros
   /// 
   /// Name follows `serde` convention
   #[doc(hidden)]
   pub mod __private {
   ```



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