Expose fromStrict/toStrict from Data.ByteString

[Bodigrim]

I often end up importing Data.ByteString.Lazy just for the sake of fromStrict / toStrict. It would be nice to re-export these two functions from Data.ByteString itself.

[sjakobi]

Sounds reasonable to me.

[Bodigrim]

Here is an example. My applications often deal with strict ByteString only:

import qualified Data.ByteString as B 

--- 100500 lines of code

foo :: ByteString
foo = B.replicate 99 99

However, if I need to pass foo to Data.Aeson.decode, which expects lazy ByteString, things get messy. I have to jump up to the imports and add import qualified Data.ByteString.Lazy as BL only to reach out for fromStrict. (And potentially change as B to as BS for consistency, which means a ton of minor edits all over the file). There are several workarounds, but the switch of context is very annoying.

import qualified Data.ByteString as BS 
import qualified Data.ByteString.Lazy as BL

bar = decode (BL.fromStrict foo)