| 1234567 |   o Code simplification and refactoring:    - The logic that directory caches use to spool request to clients,      serving them one part at a time so as not to allocate too much memory,      has been refactored for consistency.  Previously there was a separate      spooling implementation per type of spoolable data.  Now there      is one common spooling implementation, with extensible data types.      Closes ticket 21651.
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