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Every object in the PostFlow API has a unique ID. PostFlow uses a system called “Snowflake ID” created by Twitter. These IDs are 64-bit unsigned integers. Some programming languages (JavaScript) cannot accurately represent 64-bit integers.
You must ALWAYS use strings for PostFlow IDs in your code.

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String vs integer in Javascript

In JavaScript, integers are limited to 53 bits. This causes precision loss with large IDs: 
// This loses precision!
const id = 10765432100123456789;
console.log(id.toString()); // "10765432100123458000" — wrong!

// Use strings instead
const id = "10765432100123456789";
console.log(id); // "10765432100123456789" — correct!

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Comparing IDs

Examples of how you can compare PostFlow IDs: 
// Use BigInt

if (BigInt(post1.id) > BigInt(post2.id)) {
    console.log("post1 is newer");
}