Strictness in UniqFM

[Simon Peyton-Jones]

| I'll take a deeper look at making it strict.

I believe that if you do so, you'll _definitely_ need to pay attention to LoadIface.loadDecl.  Apart from that, making UniqFM strict would probably be fine.  To test this hypothesis you could use a different map for type environments, for now.  With a bit more trouble we can probably make loadDecl work again, even with strict UFMs.

Simon