53     public function __get(string $key)  argument
55         return $this->get($key);
61     public function __set(string $key, $value): void  argument
63         $this->set($key, $value);
66     public function __isset(string $key): bool  argument
68         return $this->has($key) && null !== $this->get($key);
71     public function __unset(string $key): void  argument
73         $this->remove($key);
79      * @param mixed $key
85     public function get($key)  argument
87         if (!$this->has($key)) {
88             throw new InvalidException("Field {$key} does not exist");
91         return $this->_data[$key];
101     public function set(string $key, $value): self  argument
106         $this->_data[$key] = $value;
114     public function has(string $key): bool  argument
116         return \is_array($this->_data) && \array_key_exists($key, $this->_data);
124     public function remove(string $key): self  argument
126         if (!$this->has($key)) {
127             throw new InvalidException("Field {$key} does not exist");
129         unset($this->_data[$key]);
145      * @param string $key      Key to add the file to
149     public function addFile(string $key, string $filepath, string $mimeType = ''): self  argument
157         $this->set($key, $value);
165     public function addFileContent(string $key, string $content): self  argument
167         return $this->set($key, \base64_encode($content));
173      * @param string $key Field key
177     public function addGeoPoint(string $key, float $latitude, float $longitude): self  argument
181         $this->set($key, $value);