EXC_BAD_INSTRUCTION in beta 4

Upgraded to beta 4 yesterday and perfectly working app in beta 3 now crashes in:

main > UIApplicationMain > 0_ViewList_ID.JoinedViews.subscript.getter

with the following error:

EXC_BAD_INSTRUCTION (code=EXC_I386_INVOP, subcode=0x0)


This happens on a complex view whenever the user is moving a slider, toggling a toggle or picking an element in a segmented controller.

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caram
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Digging further, it is the willChange.send(self) message for this particular view that causes the app to crash in another thread. I have other views that also send the willChange message without any crash.

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caram
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I have just submitted a bug report with an attached project.

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caram
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