Invalid TAR end

[kevinresol]

import format.tar.*;
import haxe.io.*;

using Lambda;

class Main {
    static function main() {
        function file(name:String, bytes:Bytes) return {
            fileName: name,
            fileSize: bytes.length,
            fileTime: Date.now(),
            fmod: 666,
            uid: 1,
            gid: 1,
            uname: 'u',
            gname: 'g',
            data: bytes,
        }
        
        var data = [
            file('folder/file1.txt', Bytes.alloc(4096)), // fails if: 1024, 2048, 4096, 512000, etc...
            file('folder/file2.txt', Bytes.alloc(1)),
        ].list();
        
        var output = new BytesOutput();
        new Writer(output).write(data);
        var entries = new Reader(new BytesInput(output.getBytes())).read();
        for(file in entries) trace(file.fileName, file.fileSize);
    }
}

Trying to tar some files, if the first file size is of some magic numbers, it fails to untar with Invalid TAR end