Re: Release road map - 1.14 and beyond

[Nick Yakimov <g.livid-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>]

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What about making key-value part of `Attr` into something like `MetaValue`?

E.g., from the top of my head,

```haskell
data Attr = Attr { attrId      :: String
                 , attrClasses :: [String]
                 , attrKVs     :: [(String, AttrValue)]
                 }
                 deriving (...)
```

`AttrValue` could be a simple type with several constructors, or maybe an 
existential type (something like `Data.Dynamic`? sorry, I'm not good enough 
with Haskell to determine if that would be viable)

I also still maintain that basically everything (all `Block`s and 
`Inline`s) could have `Attr` attached. From generality point of view, this 
is sound (somewhat). Implementation can be a horrific nightmare though. 
Pattern synonyms might alleviate some pains. One case where this 
immediately seems useful is matching source lines to output (something I've 
been thinking about lately) -- reader could store auxiliary line numbers in 
this "universal Attr".

One option for generalising `Attr`, that seems somewhat reasonable, is 
defining wrappers for `Block` and `Inline`, e.g. with another type ctor:

```haskell
data Block =
        ...
        | BlockAttr Attr Block
        ...
```

Or maybe with a type like

```haskell
data AttrWrapper = BlockAttr Attr Block | InlineAttr Attr Inline
```

First option would probably require fewer changes to readers/writers, but 
somehow seems less "correct".

Again, pattern synonyms can alleviate some of the pains here.

P.S. This all is not as well thought-through as I'd like to, so treat this 
as a stream of consciousness.

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