I summoned a giant in a desert and gave him a name so he wouldn't despawn. Later after being unable to find him I can only assume he got killed by the abundant cacti, which is really sad.
I know this isn't a bug per se and the Giant isn't exactly an in-game mob, but as you did just update the armor to show correctly, I hope you will consider making Giants immune to tiny damage like cacti. They shouldn't get killed by it any more than I get killed by fiberglass insulation (though I could see an argument for them stepping on cactus and running the other way).
P.S. Giants riding other animals looks hilarious. Especially bats.
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Also, feature requests aren't what this website's for, go to http://www.reddit.com/r/MinecraftSuggestions to do that.

rather think it despawned, cinse giants don't move anymore, duplicate of MC-48071

How did you name it?
Don't mark future versions as affected versions. You don't have access to them yet.