Let sendSms() name the esm_class messaging mode (#92)

* Regression tests for the messaging mode on sendSms()

* Let sendSms() name the esm_class messaging mode

* Document the messaging mode option and the decision behind it

* Name the constants move for migrating consumers and share the refusal's value naming

* Cover the messaging-mode refusals through submitSms()

* Refuse transaction mode and a report under datagram mode on sendSms()

* Narrow the mode checker and name the default mode once

src/session-options.ts

@@ -10,6 +10,7 @@ import type { Sms } from './sms.ts';
 import type { Socket } from 'node:net';
 import { backoffDefaults } from './reconnect-loop.ts';
 import { isSmsIdNotation, smsIdNotations, smsIdPlaces } from './sms-id.ts';
+import { namedValue } from './error-from.ts';
 
 export type SessionEvents = {
 	close: [];
@@ -227,8 +228,7 @@ function checkSmsIdFormat(smsIdFormat: unknown): VoidResult {
 
 		if (notation === undefined || isSmsIdNotation(notation)) continue;
 
-		// String() throws on a null-prototype object, and this value is whatever the caller passed.
-		const got = typeof notation === 'string' ? notation : typeof notation;
+		const got = namedValue(notation);
 
 		return { err: new Error(`smsIdFormat.${place} must be ${smsIdNotations.join(' or ')}, got ${got}`) };
 	}