What is the number of document reads required when using array-contains in Firestore Web?

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The number of document reads required when using array-contains in Firestore Web depends on the number of documents that match the query. Firestore charges for read operations per document, so if there are multiple documents that match the query, the number of document reads required will be higher. However, if there is only one document that matches the query, then only one document read will be required.