REF: Rename dummy fields to reserved

Author: threecgreen

CHANGELOG.md

@@ -8,6 +8,7 @@
 ### Breaking changes
 - Changed default `upgrade_policy` to `Upgrade` so by default the primary record types
   can always be used
+- Renamed `dummy` field in `ImbalanceMsg` and `StatMsg` to `reserved`
 
 ### Bug fixes
 - Added missing `StatType::Vwap` variant used in the ICE datasets

include/databento/record.hpp

@@ -299,7 +299,7 @@ struct ImbalanceMsg {
   Side unpaired_side;
   char significant_imbalance;
   // padding for alignment
-  std::array<char, 1> dummy;
+  std::array<char, 1> reserved;
 };
 static_assert(sizeof(ImbalanceMsg) == 112, "ImbalanceMsg size must match Rust");
 static_assert(alignof(ImbalanceMsg) == 8, "Must have 8-byte alignment");
@@ -323,7 +323,7 @@ struct StatMsg {
   std::uint16_t channel_id;
   StatUpdateAction update_action;
   std::uint8_t stat_flags;
-  std::array<char, 6> dummy;
+  std::array<char, 6> reserved;
 };
 static_assert(sizeof(StatMsg) == 64, "StatMsg size must match Rust");
 static_assert(alignof(StatMsg) == 8, "Must have 8-byte alignment");