Originally Posted by nixchecker
I just noticed that on the PTR the maximum message length of SendAddonMessage seems to be 255, regardless of the prefix's length. Checked again on LIVE, and it's 255, too. Has this always been the case or did i miss some patch notes? I thought the maximum length was 255 - prefix length - 1
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This has been the case for quite some time already, at least back to 2011, which was the earlist indication I could find of that.
Supposedly there was a Blizzard post to document the change, but their forum history from back then went kaput.