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Remember all the weirdness around Collections and VB6 when VB.NET came out?  I just noticed this breaking change as we move from 1.1 to Whidbey.  Previously added workaround code will have to be removed.

VB collections have weird implementation of IList: 0 based for read and -1 based for insertion
Affected APIs none
: Ilist implementation of VB collection is fixed
Affected Assemblies\Dll(s): Microsoft.VisualBasic.dll
Affected Scenarios: Upgraded apps that use VB Collection through inconsistent implementation of Ilist (very unlikely scenario) may be broken.
Description: An instance of Collection type is casted to Ilist and then used via Ilist interface. To make this work in 7.0, 7.1 you would need to specialcase access to Ilist if it holds Collection
Workaround Code that has special-case warkarounds to use Collections casted to Ilist, will have to remove workarounds.



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