fix(List): toString is different from toJSON

src/containers/Sequence.js

@@ -120,13 +120,17 @@ export class SequenceContainer {
   }
 
   toJSON() {
-    return this.toString()
+    let res = []
+    for (const value of this) {
+      res.push(JSON.stringify(value))
+    }
+    return '[ ' + res.join(', ') + ' ]'
   }
 
   toString() {
     let res = []
     for (const value of this) {
-      res.push(JSON.stringify(value))
+      res.push(value.toString())
     }
     return '[ ' + res.join(', ') + ' ]'
   }

test/List.test.js

@@ -134,4 +134,5 @@ test('pushBack, pushFront, popBack, popFront, back, front', () => {
 
 test('toJSON, toString', () => {
   expect(List.from([1, 2]).toJSON()).toEqual('[ 1, 2 ]')
+  expect(List.from([0n]).toString()).toEqual('[ 0 ]')
 })