diff --git a/README.md b/README.md
index e7335c7..fe7aca0 100644
--- a/README.md
+++ b/README.md
@@ -152,6 +152,23 @@ Default type: object, With option type: bigint
 
 ```
 
+**Exception**: if the number being parsed is a big decimal number, still returns it as BigNumber.
+
+```js
+var JSONbig = require('json-bigint');
+var JSONbigNative = require('json-bigint')({ useNativeBigInt: true });
+var key = '{ "key": 993143214321423154315154321.1 }';
+console.log(`\n\nStoring the Number as a BigNumber!!`);
+console.log('Input:', key);
+var normal = JSONbig.parse(key);
+var nativeBigInt = JSONbigNative.parse(key);
+console.log(
+  'Default type: %s, With option type: %s',
+  typeof normal.key,
+  typeof nativeBigInt.key
+);
+````
+
 #### options.alwaysParseAsBig, boolean, default false
 
 Specifies if all numbers should be stored as BigNumber.
diff --git a/lib/parse.js b/lib/parse.js
index bb4e5eb..2f03c3b 100644
--- a/lib/parse.js
+++ b/lib/parse.js
@@ -169,6 +169,24 @@ var json_parse = function (options) {
       at += 1;
       return ch;
     },
+    asBigNumber = function (v) {
+      if (BigNumber == null) {
+        BigNumber = require('bignumber.js');
+      }
+
+      var bigNum = new BigNumber(v);
+      if (!_options.useNativeBigInt) {
+        return bigNum;
+      }
+
+      if (!bigNum.isInteger()) {
+        // only case where we return BigNumber when 'useNativeBigInt' is true
+        // would only happen if parsing a very big decimal number
+        return bigNum
+      }
+
+      return BigInt(bigNum.toFixed());
+    },
     number = function () {
       // Parse a number value.
 
@@ -205,21 +223,16 @@ var json_parse = function (options) {
       if (!isFinite(number)) {
         error('Bad number');
       } else {
-        if (BigNumber == null) BigNumber = require('bignumber.js');
         //if (number > 9007199254740992 || number < -9007199254740992)
         // Bignumber has stricter check: everything with length > 15 digits disallowed
         if (string.length > 15)
           return _options.storeAsString
             ? string
-            : _options.useNativeBigInt
-            ? BigInt(string)
-            : new BigNumber(string);
+            : asBigNumber(string);
         else
           return !_options.alwaysParseAsBig
             ? number
-            : _options.useNativeBigInt
-            ? BigInt(number)
-            : new BigNumber(number);
+            : asBigNumber(number);
       }
     },
     string = function () {
diff --git a/package-lock.json b/package-lock.json
index dc661f1..1e303f9 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -336,6 +336,15 @@
       "integrity": "sha512-eGuFFw7Upda+g4p+QHvnW0RyTX/SVeJBDM/gCtMARO0cLuT2HcEKnTPvhjV6aGeqrCB/sbNop0Kszm0jsaWU4A==",
       "dev": true
     },
+    "fast-check": {
+      "version": "2.6.0",
+      "resolved": "https://registry.npmjs.org/fast-check/-/fast-check-2.6.0.tgz",
+      "integrity": "sha512-Wpz0mMPGxvOtMBaEguu5Pw35uTVfJzAUqRYQksiHk6vHKBV2YNeKk9BzTuqVCYwUIl+NELyPBY2Mg96sYk2fhw==",
+      "dev": true,
+      "requires": {
+        "pure-rand": "^3.0.0"
+      }
+    },
     "fill-range": {
       "version": "7.0.1",
       "resolved": "https://registry.npmjs.org/fill-range/-/fill-range-7.0.1.tgz",
@@ -773,6 +782,12 @@
         "iterate-value": "^1.0.0"
       }
     },
+    "pure-rand": {
+      "version": "3.1.0",
+      "resolved": "https://registry.npmjs.org/pure-rand/-/pure-rand-3.1.0.tgz",
+      "integrity": "sha512-xkCSMNjEnLG/A8iTH9M5ayXN4SCWRP+ih3rxi09Q7Fu0b9jAP6V9H59pOtcB37IsVt3eHxf1FMy9n7YrqdDdSA==",
+      "dev": true
+    },
     "readdirp": {
       "version": "3.3.0",
       "resolved": "https://registry.npmjs.org/readdirp/-/readdirp-3.3.0.tgz",
diff --git a/package.json b/package.json
index 9309f6b..00b3f2e 100644
--- a/package.json
+++ b/package.json
@@ -29,6 +29,7 @@
   },
   "devDependencies": {
     "chai": "4.2.0",
+    "fast-check": "^2.6.0",
     "mocha": "8.0.1"
   }
 }
diff --git a/test/bigint-parse-test.js b/test/bigint-parse-test.js
index e9755ff..d49a967 100644
--- a/test/bigint-parse-test.js
+++ b/test/bigint-parse-test.js
@@ -2,6 +2,7 @@ var mocha = require('mocha')
   , assert = require('chai').assert
   , expect = require('chai').expect
   , BigNumber = require('bignumber.js')
+  , fc = require('fast-check')
   ;
 
 describe("Testing native BigInt support: parse", function () {
@@ -56,4 +57,14 @@ describe("Testing native BigInt support: parse", function () {
     expect(output).to.equal(input);
     done();
   });
+
+  it("Should show JSONbig does support native Bigint parse/stringify roundtrip with any valid JSON value", function (done) {
+    var JSONbig = require('../index')({
+      "useNativeBigInt": true
+    });
+    fc.assert(fc.property(fc.jsonObject(), (v) => {
+      JSONbig.parse(JSONbig.stringify(v))
+    }));
+    done();
+  });
 });
\ No newline at end of file
diff --git a/test/bigint-test.js b/test/bigint-test.js
index 046aa5b..1a18827 100644
--- a/test/bigint-test.js
+++ b/test/bigint-test.js
@@ -2,6 +2,7 @@ var mocha  = require('mocha')
   , assert = require('chai').assert
   , expect = require('chai').expect
   , BigNumber = require('bignumber.js')
+  , fc = require('fast-check')
   ;
 
 describe("Testing bigint support", function(){
@@ -28,4 +29,12 @@ describe("Testing bigint support", function(){
         expect(output).to.equal(input);
         done();
     });
+
+    it("Should show JSONbig does support bigint parse/stringify roundtrip with any valid JSON value", function (done) {
+        var JSONbig = require('../index');
+        fc.assert(fc.property(fc.jsonObject(), (v) => {
+            JSONbig.parse(JSONbig.stringify(v))
+        }));
+        done();
+    });
 });