Holding down attack button burns durability faster

[Bumber64]

Describe the bug
Holding down the attack button against a mob burns durability (and energy) faster than spamming it.

To Reproduce

1. Drink an energy potion.
2. Fight the obsidian knight by spamming attack.
3. Repeat the fight but holding attack button instead.
4. Observe that you wasted more weapons, possibly running out of them.

Expected behavior
Weapons should only lose durability per attack dealt.

Desktop

• OS: Windows 8.1
• Game version: 2.3.0-dev2

Additional context
Not entirely sure if it's because the game reduces durability per frame with attack button held (instead of per action performed), or if durability is being wasted on mob invincibility frames. Possibly applies to mining with pickaxe?

[BenCheung0422]

Durability is reduced only when there is enough stamina to be consumed. An attack is when you "attacked" something at that moment. The minimal attack cooldown is 5 ticks while the triggering depends on your keyboard key repeating frequency. Also, the length of invincibility frames of a mob is 10 ticks. Interactions with tiles are in a different mechanism.