♻️ refactor(_from_small_list): Do not use default case.

Author: make-github-pseudonymous-again

src/0-core/_fast/_from_small_list.js

@@ -3,8 +3,15 @@ import {Empty, Single, Deep} from '../../3-tree/index.js';
 import {One, Two} from '../../1-digit/index.js';
 import {cache} from '../measure/index.js';
 
+export const THRESHOLD = 3;
+
 export function _from_small_list(M, list) {
-	assert(Number.isInteger(list.length) && list.length >= 0 && list.length <= 3);
+	assert(
+		Number.isInteger(list.length) &&
+			list.length >= 0 &&
+			list.length <= THRESHOLD,
+	);
+	// eslint-disable-next-line default-case
 	switch (list.length) {
 		case 0:
 			return new Empty(M);
@@ -17,7 +24,7 @@ export function _from_small_list(M, list) {
 				new Empty(cache(M)),
 				new One(list[1]),
 			);
-		default:
+		case 3:
 			return new Deep(
 				M,
 				new Two(list[0], list[1]),