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Intermediate
A developer compares `storeId: 7` stored as Int32 with `storeId: NumberLong(7)` in analytics queries. What should they account for?
All integers are stored as Double, so the original numeric type cannot matter.
BSON has several numeric types; drivers and queries can compare numeric values, but schema consistency avoids driver and aggregation surprises.
MongoDB rejects mixed numeric types in one collection.
A numeric field must be declared in the collection before any insert.
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