I'm losing my mind. I have an array of objects called allAvailabilities

console.log(allAvailabilities[0]);

results in a object with various properties, one of which is:

...
isTrainee: true
...

but

console.log(allAvailabilities[0]['isTrainee']);
console.log(allAvailabilities[0].isTrainee);

results in

false
false

I'm not understanding what is preventing me from accessing the actual isTrainee value of the object property:

console.log(typeof(allAvailabilities[0]['isTrainee']));
console.log(typeof(allAvailabilities[0].isTrainee));
console.log(allAvailabilities[0]['isTrainee'].toString());
console.log(allAvailabilities[0].isTrainee.toString());

results in:

boolean
boolean
false
false

How is this possible? Am I overlooking a fundamental piece of Javascript syntax? Does this have to do with the Boolean class as described here: Why does !new Boolean(false) equals false in JavaScript?

The snippet works fine, what does this mean?

var allAvailabilities = [{_id: '605a5dd76f007e84f28e35fd', begin: '2021-04-03T18:00:00.000Z', end: '2021-04-03T20:30:00.000Z', season: 'regular', hostModel: 'users', isTrainee: true, season: "regular"}];


            console.log(allAvailabilities[0]);
            console.log(typeof(allAvailabilities[0]['isTrainee']));
            console.log(typeof(allAvailabilities[0].isTrainee));
            console.log(allAvailabilities[0]['isTrainee'].toString());
            console.log(allAvailabilities[0].isTrainee.toString());

How can this be?

The original allAvailabilities array comes from an API, and each object in the array is modified to have the isTrainee property like so, immediately before calling the code I am having problems with: