binrep-instances

Orphan instances for binrep.

binrep mostly cares about standalone data types that are exclusively used with its type classes. However, my strongweak library lends itself to working together with binrep. But it requires a couple of orphan instances, and adds some non-orphan but out-of-place instances to binrep (WeakenN is an "ignore" layer, which otherwise doesn't fit in binrep). It's kind of like an extension.

Such orphan instances are pulled out into this library.