Add JSON::Any#to_a and JSON::Any#to_h

[makenowjust]

It keeps values as JSON::Any. Refs #3881

For example, we can use Hash#each with JSON::Any values:

require "json"

json = JSON.parse %({"foo": 1, "bar": [2, 3]})
json.to_h.each do |key, value|
  pp key
  pp typeof(key)
  pp value
  pp typeof(value)
end

[makenowjust]

I think it is useful in some case, for example we want to apply Array#zip with JSON array.

[asterite]

Thank you, but this is slow because it allocates new arrays and hashes.

JSON::Any is supposed to be used to quickly get some value out of a big complex JSON, and not as the preferred way to deal with JSON. In most cases JSON.mapping can be used. If not, you'll have to use casting because JSON data is not typed.

[makenowjust]

@asterite Yes. I think so too.