Failure to do postJSON with numeric values in the JSON body

Below is the snippet for my test code. The body works fine if it has string key-value pairs. But it fails when numeric values are passed in the body. Also, I cross checked by using Postman that this same snippet containing numeric body works OK. Any suggestion as to what could i try next would be appreciable.

var body = {
"List": {
"pgSize": 1,
"pgNumber": 50,
"State": "On"
}
};

var headers = {
"Authorization": me.AccessToken,
"Content-Type": "application/json",
"Accept-Encoding": "gzip, deflate, br",
"Accept": "application/json",
};
var params = {
proxyScheme: undefined /* STRING */ ,
headers: headers /* JSON */ ,
ignoreSSLErrors: undefined /* BOOLEAN */ ,
useNTLM: undefined /* BOOLEAN */ ,
workstation: undefined /* STRING */ ,
useProxy: undefined /* BOOLEAN */ ,
withCookies: undefined /* BOOLEAN */ ,
proxyHost: undefined /* STRING */ ,
url: url /* STRING */ ,
content: body /* JSON */ ,
timeout: undefined /* NUMBER */ ,
proxyPort: undefined /* INTEGER */ ,
password: undefined /* STRING */ ,
domain: undefined /* STRING */ ,
username: undefined /* STRING */
};
// responseJSON: JSON
var responseJSON = Resources["ContentLoaderFunctions"].PostJSON(params);