I was waddling about and looking at a spider when, in the middle of the day attacked me when I didn't previously anger it.
Also not relating to bugs where can people suggest things that should be added to minecraft?
MC-66676
Spiders spontaneous hostility to player.
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http://www.reddit.com/r/minecraftsuggestions is one I've seen mentioned by the mods here before.
As to this – from my memory of spiders' hostility mechanics, if they're in dark enough shade, they won't be neutral. If they decide to target you, they will remain hostile even if they step into sunlight.
Spiders are only changed from hostile to neutral when they are standing on a block in sunlight, and they haven't already targeted the player.