[history] Added .toString() for debugging

src/commonMain/kotlin/ru/landrafhomyak/utility/reference_counter/CloseableReferenceCounter.kt

@@ -51,6 +51,14 @@ internal class CloseableReferenceCounter(private val _errMessage: String) {
 		return safeAutoClose1(finally = this::decref, action = protected)
 	}
 
+	override fun toString(): String {
+		val refcntCached = this._value.value
+		if (refcntCached < 0)
+			return "<ref counter [closed]>"
+		else
+			return "<ref counter [${refcntCached}]>"
+	}
+
 	private fun AtomicLong.compareAndExchange(expected: Long, newValue: Long): Long {
 		while (true) {
 			val old = this@compareAndExchange.value