Please describe the new feature or change.
Various whitelists for customized tiers of item durability damage.

Please describe why you want this feature.
Death would be less punishing with higher-tier items, as determined by modpack creators. Certain items could be particularly fragile and take 50 or 100% durability damage from dying, while end-game armor would not only have higher base durability, but also suffer less percentage-wise from death.

Ideally you'd somehow be able to set your own "tiers". The default would be determined by these values:
# Percent of durability lost on death for drops

# Percent of durability lost on death for kept items

Everything else would be a whitelist, you could set for example tiers of "15%, 10%, 5%" durability loss and add items like minecraft:iron_sword, minecraft:fishing_rod to a given tier.