Shorten cache key lengths using md5

[brycedrennan]

Some cache backends, like memcache, can't have keys longer than 250 characters.

Resolves issue #31

[srenault]

Hey @brycedrennan.
First, thanks for you PR.
About this, I doubt it's the good place to do it.
Why don't you do it in your cache implementation level?
Because as you said, it's specific for each cache backends.
Having hashed keys is hard to debug when inspecting keys.

[brycedrennan]

I agree philosophically that the cache implementation should handle this.

More pragmatically though, handling it in the library makes the library just work out of box. The vanilla cache implementations out there don't handle this key shortening (including the one mentioned in the docs). Otherwise what happens is someone sets up prismic and everything works great until one day a key is too long and things break. It's unexpected.

Is there any downside to using more compatible keys?

[brycedrennan]

Will this be merged or should I close the PR?

[brycedrennan]

Closing due to lack of response.