Kevin Ballard on Twitter: "@brentsimmons Non-@objc protocols use a virtual function table (called a protocol witness table) rather than message-passing."

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Brent Simmons ‏@brentsimmons 2 Aug 2015

Filed as rdar://22109003
Kevin Ballard ‏@eridius 2 Aug 2015

@brentsimmons The reason why `messages as [NodeRepresentedObject]` doesn’t work is because it would make `as` be unexpectedly expensive.
1 retweet 2 likes
Brent Simmons ‏@brentsimmons 2 Aug 2015

@eridius It just has to check once that EmailMessage is a NodeRepresentedObject. It shouldn't have to check for each item.
Kevin Ballard ‏@eridius 2 Aug 2015

@brentsimmons It’s not a type-check. The in-memory representation is different. It has to allocate a new array with the new values.
1 retweet 8 likes

Kevin Ballard