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Put DiffArray in its own diffarray package

!DiffArray currently has serious performance problems (see #2727 (closed)), and is not currently being actively maintained. However, as part of the corelib array it gives the impression that it is a "blessed" library.

I propose that we split !DiffArray off into its own diffarray package. This also has the advantage that it can then be maintained by a separate maintainer, if someone is interested, and it will be decoupled from GHC's major release schedule.

Deadline: 26 July (2 weeks).

Trac metadata
Trac field Value
Version 6.10.2
Type Bug
TypeOfFailure OtherFailure
Priority normal
Resolution Unresolved
Component libraries (other)
Test case
Differential revisions
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Related
Blocking
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Operating system
Architecture
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