From 62aa57af803c6ad09f10e979f2a069168b4d167c Mon Sep 17 00:00:00 2001
From: Matthias Kunnen <matthias.kunnen@gmail.com>
Date: Sat, 23 Jan 2021 22:20:00 +0000
Subject: [PATCH] Deal with null and undefined in mapType documentation

---
 readme.md | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/readme.md b/readme.md
index 8fe3b02..ef3a8ff 100644
--- a/readme.md
+++ b/readme.md
@@ -76,13 +76,13 @@ import {jsonObject, jsonMember, TypedJSON} from 'typedjson';
 import * as Decimal from 'decimal.js'; // Or any other library your type originates from
 
 TypedJSON.mapType(BigInt, {
-    deserializer: json => new BigInt(json),
-    serializer: value => value.toString(),
+    deserializer: json => value == null ? value : new BigInt(json),
+    serializer: value => value == null ? value : value.toString(),
 });
 
 TypedJSON.mapType(Decimal, {
-    deserializer: json => new Decimal(json),
-    serializer: value => value.toString(),
+    deserializer: json => value == null ? value : new Decimal(json),
+    serializer: value => value == null ? value : value.toString(),
 });
 
 @jsonObject