feat: add tiny dedupe

src/main/java/pw/mihou/nexus/features/react/React.kt

@@ -215,7 +215,7 @@ class React internal constructor(private val api: DiscordApi, private val render
  val oldValue = _value.get()
  _value.set(value)
 
- subscribers.forEach { Nexus.launcher.launch { it(oldValue, value) } }
+ this.react(oldValue, value)
  }
 
  /**
@@ -231,7 +231,7 @@ class React internal constructor(private val api: DiscordApi, private val render
  _value.getAndUpdate(updater)
 
  val value = _value.get()
- subscribers.forEach { Nexus.launcher.launch { it(oldValue, value) } }
+ this.react(oldValue, value)
  }
 
  /**
@@ -254,6 +254,17 @@ class React internal constructor(private val api: DiscordApi, private val render
  return { subscribers.remove(subscription) }
  }
 
+ /**
+ * Reacts to the change and executes all the subscriptions that were subscribed at the
+ * time of execution.
+ *
+ * @param oldValue the old value.
+ * @param value the current value.
+ */
+ internal fun react(oldValue: T, value: T) {
+ subscribers.forEach { Nexus.launcher.launch { it(oldValue, value) } }
+ }
+
  override fun toString(): String {
  return _value.get().toString()
  }