diff --git a/modules/ext.RevisionSlider.Revision.js b/modules/ext.RevisionSlider.Revision.js
index 1d29b1b5..c697f992 100644
--- a/modules/ext.RevisionSlider.Revision.js
+++ b/modules/ext.RevisionSlider.Revision.js
@@ -33,7 +33,7 @@ $.extend( Revision.prototype, {
 	/**
 	 * @type {string[]}
 	 */
-	tags: [],
+	tags: null,
 
 	/**
 	 * @type {boolean}
diff --git a/modules/ext.RevisionSlider.RevisionList.js b/modules/ext.RevisionSlider.RevisionList.js
index 24c2f28b..b5b21524 100644
--- a/modules/ext.RevisionSlider.RevisionList.js
+++ b/modules/ext.RevisionSlider.RevisionList.js
@@ -66,6 +66,9 @@ $.extend( RevisionList.prototype, {
 		return this.availableTags;
 	},
 
+	/**
+	 * @return {Object.<string,string>}
+	 */
 	getUserGenders: function () {
 		const userGenders = {};
 		this.revisions.forEach( function ( revision ) {
diff --git a/src/RevisionSliderHooks.php b/src/RevisionSliderHooks.php
index 0771bd8d..1122ba1b 100644
--- a/src/RevisionSliderHooks.php
+++ b/src/RevisionSliderHooks.php
@@ -79,7 +79,7 @@ class RevisionSliderHooks implements DifferenceEngineViewHeaderHook, GetPreferen
 			$this->statsdDataFactory->increment( 'RevisionSlider.event.lazyload' );
 		}
 		$out->addModuleStyles( 'ext.RevisionSlider.noscript' );
-		$out->addJsConfigVars( 'extRevisionSliderTimeOffset', intval( $timeOffset ) );
+		$out->addJsConfigVars( 'extRevisionSliderTimeOffset', $timeOffset );
 		$out->enableOOUI();
 
 		$out->prependHTML( $this->getContainerHtml( $autoExpand ) );