[1.7.3] Mirror Image duration bug (and some other issues)

[trungaczne]

Mirror Image (phantasm) has 1 more health than the stated amount because it doesn't die at 0HP, it dies at negative health. Say, if the duration says it has 6HP, it can replicate 7 spells before disappearing. I think the expected behavior here is that it should die at 0 HP.

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The mirror image doesn't replicate attacks that are marked as spells properly. I suppose this isn't easily fixed, but just stating some examples:
Shadowstep (this is more noticeable, it's on Shadowblade who has access to the Phantasm tree) simply fizzles: no log line, mirror image loses 1 health (and doesn't taunt in the same turn). This is also true for similar attacks such as Virulent Strike or Absorption Strike.
Blink Blade is weirder: the mirror image will attempt the random blink, there's a log saying that it's casting the spell, but it will do 0 damage on the attacks.

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Entropy burn (from cultist of entropy's spells) seemingly reduces the mirror image's health if it tries to replicate this, but this is only a display bug - a 6HP mirror image can decay to 1 health but still replicate 6 spells just fine.
This is to contrast, say, Blood Grasp's max health increase effect which is ignored by the mirror image properly.