Relaxed type signature for mergeSources

[dmcclean]

The current type of (>=<) and mergeSources requires the Sources being merged to use a monad of the form ResourceT m for some m. For example:

(>=<) :: (MonadIO m, MonadBaseControl IO m) => Source (ResourceT m) a -> Source (ResourceT m) a -> ResourceT m (Source (ResourceT m) a)

If possible, it would be great if this signature could be relaxed to a type like this one:

(>=<) :: (MonadIO m, MonadBaseControl IO m, MonadResource m) => Source m a -> Source m a -> ResourceT m (Source m a)

There may be some reason why this can't work, in which case I apologize for raising the issue. It does seem that it was once this way until version 0.4, so perhaps it was discovered to be unworkable.

If it is unworkable, you are aware of a workaround, and have time to explain it briefly that would be awesome. Thanks for the great library.

[bfops]

LGTM. I haven't looked at this with a super-pessimistic eye, but it's been on my mind for a few weeks now. As far as I can tell, if you can get it to typecheck, it should work fine. Thanks!

[bfops]

LGTM. I haven't looked at this with a super-pessimistic eye, but it's been on my mind for a few weeks now. As far as I can tell, if you can get it to typecheck, it should work fine. Thanks!

[dmcclean]

Ignore the one with hash a2a49ca, I forgot to make a branch before I pushed that one.

I think it would probably make sense to perform a similar surgery to mergeConduits for consistency, but I'm a little bit baffled by where the changes belong to make it happen.

[dmcclean]

Ignore the one with hash a2a49ca, I forgot to make a branch before I pushed that one.

I think it would probably make sense to perform a similar surgery to mergeConduits for consistency, but I'm a little bit baffled by where the changes belong to make it happen.