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wp-content/plugins/jetpack-boost/app/data-sync/class-mergeable-array-entry.php

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+<?php
+
+namespace Automattic\Jetpack_Boost\Data_Sync;
+
+use Automattic\Jetpack\WP_JS_Data_Sync\Contracts\Entry_Can_Get;
+use Automattic\Jetpack\WP_JS_Data_Sync\Contracts\Entry_Can_Merge;
+
+class Mergeable_Array_Entry implements Entry_Can_Get, Entry_Can_Merge {
+	private $option_key;
+
+	public function __construct( $option_key ) {
+		$this->option_key = $option_key;
+	}
+
+	public function get( $fallback_value = false ) {
+		// WordPress looks at argument count to figure out if a fallback value was used.
+		// Only provide the fallback value if it's not the default ( false ).
+		if ( $fallback_value !== false ) {
+			return get_option( $this->option_key, $fallback_value );
+		}
+		return get_option( $this->option_key );
+	}
+
+	public function set( $value ) {
+		update_option( $this->option_key, $value, false );
+	}
+
+	public function merge( $value, $partial_value ) {
+		return array_merge( $value, $partial_value );
+	}
+}