Each bin can only store numbers < 2^16

[boris9a9]

Hello Loom network,
I'm trying to implement FT base on ERC721x, I have a question about the maximum amount of items in one asset (TokenId):
Is is true that Each bin can only store numbers < 2^16, that means every asset (with asset's TokenId) can only has maximum of 2^16 items?

In case I want to increase this amount (for example: 2^32), how can I do that?
Thank you