Say what coercion would put on the wire, in the tense the test now holds

test/pdu.test.ts

@@ -154,7 +154,7 @@ describe('parsing real PDUs', () => {
 		assert.equal(smuggled.buffer, undefined);
 		assert.ok(objToPdu({ cmdName: 'deliver_sm', params: { source_addr: '一' } }).err instanceof Error);
 
-		// String(NaN) is a sender the peer reads as the three letters, and the send reports success.
+		// Coercing these spells the senders "NaN" and "Infinity", which a peer reads as those letters.
 		assert.ok(objToPdu({ cmdName: 'deliver_sm', params: { source_addr: NaN } }).err instanceof Error);
 		assert.ok(objToPdu({ cmdName: 'deliver_sm', params: { source_addr: Infinity } }).err instanceof Error);
 	});