These are new in base-4.10; I had no idea they existed until Rob
pointed them out. This adds them to the Prologue and institutes hlint
rules to suggest when we can use them.
Though the previous definition (a type synonym that wrapped `Join (,)`)
was clever, it required a number of orphan instances, as well as an extra
`both` function to simulate a `Both` constructor. Using an ordinary data
structure removes the need for orphan instances.
Provides a `Push` type. To build that, we needed `RequestContext`,
`UserType`, `RequestMethod`, `Spamurai`, `Timestamp`, and `IPVersion`.
The schemas have all been taken from https://github.com/github/hydro-schemas/.
Now that we're on GHC 8.6, we can use `-XDerivingVia` in many cases
where we previously had to write instances by hand. If you're not
familiar with `-XDerivingVia`, the [GHC proposal][ghc] is a good place
to start.
[ghc]: https://github.com/ghc-proposals/ghc-proposals/blob/master/proposals/0023-deriving-via.rst
Thanks to the `generic-monoid` package, we can derive a `Semigroup`
instance for any product type whose members are `Semigroups`, and the
same goes for `Monoid`. This entails an extra dependency, but it is
better than the `generic-deriving` package, which is way too much overhead.
I've also switched some trivial definitions to newtype-deriving.
Please be aware that this bumps `hlint` and `haskell-src-exts` so that
`hlint` doesn't choke on the `DerivingVia` extension. You'll need to
`stack install hlint` to get it on your `PATH`. Apologies!
Bumps most of our dependencies.
Code changes:
* algebraic-graphs-0.3 no longer provides a Foldable or Traversable
implementation for `Graph`, so now neither does our `Graph` type.
* CMark parsing now uses safe rendering of raw HTML/URLs by default,
so there is no reason to pass an `optSafe` anymore.
* algebraic-graphs now no longer requires an Eq constraint on the
output type it generates, so we can ditch our Serializing.DOT
module. (Andrey fixed this for us specifically!)
