From 2ee2065dcc5d674f863069b461b798c23386f00a Mon Sep 17 00:00:00 2001
From: Dennis Kaspar <admin@kapsonfire.de>
Date: Sat, 27 Mar 2021 13:38:22 +0100
Subject: [PATCH 1/2] Update README.md

Possible to save size in BigInt Handling, when using Number if its in SAFE range
---
 README.md | 26 +++++++++++++++-----------
 1 file changed, 15 insertions(+), 11 deletions(-)

diff --git a/README.md b/README.md
index 1704ba05..a6838cd7 100644
--- a/README.md
+++ b/README.md
@@ -361,17 +361,21 @@ import { encode, decode, ExtensionCodec } from "@msgpack/msgpack";
 const BIGINT_EXT_TYPE = 0; // Any in 0-127
 const extensionCodec = new ExtensionCodec();
 extensionCodec.register({
-  type: BIGINT_EXT_TYPE,
-  encode: (input: unknown) => {
-    if (typeof input === "bigint") {
-      return encode(input.toString());
-    } else {
-      return null;
-    }
-  },
-  decode: (data: Uint8Array) => {
-    return BigInt(decode(data));
-  },
+    type: BIGINT_EXT_TYPE,
+    encode: (input: unknown) => {
+        if (typeof input === "bigint") {
+            if (input <= Number.MAX_SAFE_INTEGER && input >= Number.MIN_SAFE_INTEGER) {
+                return encode(parseInt(input.toString(), 10));
+            } else {
+                return encode(input.toString());
+            }
+        } else {
+            return null;
+        }
+    },
+    decode: (data: Uint8Array) => {
+        return BigInt(decode(data));
+    },
 });
 
 const value = BigInt(Number.MAX_SAFE_INTEGER) + BigInt(1);

From 2732911161595898a6c481199697eb1f0b91465d Mon Sep 17 00:00:00 2001
From: Dennis Kaspar <admin@kapsonfire.de>
Date: Thu, 1 Apr 2021 07:29:10 +0200
Subject: [PATCH 2/2] Update codec-bigint.test.ts

Changed the test to encode as number if its in SAFE_INTEGER Area.
---
 test/codec-bigint.test.ts | 14 +++++++++-----
 1 file changed, 9 insertions(+), 5 deletions(-)

diff --git a/test/codec-bigint.test.ts b/test/codec-bigint.test.ts
index f10ff725..479383c2 100644
--- a/test/codec-bigint.test.ts
+++ b/test/codec-bigint.test.ts
@@ -5,11 +5,15 @@ const extensionCodec = new ExtensionCodec();
 extensionCodec.register({
   type: 0,
   encode: (input: unknown) => {
-    if (typeof input === "bigint") {
-      return encode(input.toString());
-    } else {
-      return null;
-    }
+     if (typeof input === "bigint") {
+        if (input <= Number.MAX_SAFE_INTEGER && input >= Number.MIN_SAFE_INTEGER) {
+            return encode(parseInt(input.toString(), 10));
+        } else {
+            return encode(input.toString());
+        }
+     } else {
+        return null;
+     }
   },
   decode: (data: Uint8Array) => {
     return BigInt(decode(data));