Unclear from docs if creating a new Packr, shares the record structure over multiple pack(data)

[shirecoding]

I am not sure if this is correct, but if i create a new global instance of a packer

let packr = new Packr()

...
// calling over multiple calls
packr.pack(events);
packr.pack(events);
packr.pack(events);

will the multiple calls use the shared records to optimize events? or does it only work per call and after that the structure is lost in between calls?