Extract caching into its own module.

[beauby]

No description provided.

[beauby]

Note that now that caching is inside a mixin, the actual serializer definition is in the second position in the call stack.

[bf4]

Could still be the below, right?

def inherited(base)
  caller_line = caller.first
  super
  base._cache_digest = digest_caller_file(caller_line)
end

Also, I'd rather use caller[1] than second just because I prefer to avoid core extensions. I'm not sure if you have a preference.

[bf4]

though, we should probably rename the local var to serializer_source_location

[beauby]

Nope, the Caching#inherited method is always called from Serializer#inherited. I did make the change to caller[1] though.

[bf4]

💯 I'm not big on the extra-a-module pattern, but I really think this helps us better understand the parts of the serializer public api. Interestingly, there was once a Serializer::DSL object, but it was only in the refactor branch.

[bf4]

I'm ok to merge this once tests pass

[beauby]

Tests passed, I'm merging as @bf4 agreed.