Have drop() name the event a lost link warrants, and name requestOnCurrentLink() for what it does

test/session-extras.test.ts

@@ -1460,19 +1460,20 @@ describe('LinkLife', () => {
 		assert.match(link.refusal()?.message ?? '', /closed/, 'stopped while down');
 		link.end();
 		assert.equal(link.awaitsNextLink(), false, 'ended');
-		assert.equal(new LinkLife({ log: silentLog, reconnects: false, timeout: 100 }).drop(), true);
 	});
 
-	test('drops an attached link once, and counts each drop', () => {
+	test('drops an attached link once, counts each drop, and names the event it warrants', () => {
 		const link = new LinkLife({ log: silentLog, reconnects: true, timeout: 100 });
 		const generation = link.generation();
 
-		assert.equal(link.drop(), true);
-		assert.equal(link.drop(), false, 'already down');
+		assert.equal(link.drop(), 'disconnected');
+		assert.equal(link.drop(), undefined, 'already down');
 		assert.equal(link.generation(), generation + 1);
 		link.attach();
-		assert.equal(link.drop(), true, 'a new link drops again');
+		link.stop();
+		assert.equal(link.drop(), 'close', 'a new link drops again, with none to follow it');
 		assert.equal(link.generation(), generation + 2);
+		assert.equal(new LinkLife({ log: silentLog, reconnects: false, timeout: 100 }).drop(), 'close');
 	});
 
 	test('releases a held request with the reason once the link ends', async () => {