Enable `-fno-full-laziness -funbox-strict-fields` for the entire library?

[sjakobi]

These flags are currently enabled in Data.HashMap.Internal, Data.HashMap.Internal.Array and Data.HashMap.Internal.List. It would be good to figure why these flags are enabled for these modules and also whether there are specific reasons for not enabling them in the remaining modules.

If these flags are useful, I think it would be best to enable them in the ghc-options in u-c.cabal.

[sjakobi]

-fno-full-laziness was introduced in fa4802e. The custom runST implementation has since been removed. Maybe we can get rid of the flag too now?!

[sjakobi]

#229 (comment) gives some context for -funbox-strict-fields.