HyperLeash has been rewritten for 1.21!

The data pack's functionality has slightly changed so as to avoid relying on nametags. Please read the changes below.

• Mobs attached to the player can now easily be releashed to other mobs by holding shift and leashing a second mob. This disconnects the original mob from you and causes you to start leading the new mob, making it easy to strong together long mob caravans.
• Leading unleashable mobs is no longer possible with a nametag. I do not plan on reimplementing this, as leashable boats in 1.21 should make it much easier to transport unleashable mobs.
• Launching mobs with fireworks works as it did before, but has been slightly simplified internally.