Require data argument in WeekViewItem again

Author: thellmund

core/src/main/java/com/alamkanak/weekview/CalendarExtensions.kt

@@ -61,8 +61,6 @@ internal val Calendar.year: Int
 
 internal fun Calendar.isEqual(other: Calendar) = timeInMillis == other.timeInMillis
 
-internal fun Calendar.isNotEqual(other: Calendar) = isEqual(other).not()
-
 internal operator fun Calendar.plus(days: Days): Calendar {
     return copy().apply {
         add(Calendar.DATE, days.days)

core/src/main/java/com/alamkanak/weekview/WeekViewItem.kt

@@ -19,7 +19,7 @@ data class WeekViewItem(
     val timing: Timing,
     val style: Style = Style(),
     val configuration: Configuration = Configuration(),
-    val data: Any? = null,
+    val data: Any,
 ) {
 
     /**