Find coerce_type for Array when not specified

[manovotn]

This PR is an attempt to address issue #795 .
I am not sure I understood it correctly, but it seemed to me that @maxd wanted to create an Array type without specifying what's inside the Array.
I also added one test to make sure this works.

[dblock]

I think this is good. It needs a CHANGELOG entry and definitely more tests: calling the API with an invalid value to start.

[manovotn]

I updated changelog and added some tests.
However one of the tests is failing and I could use some advice on how to resolve this. I am a Ruby beginner so it is likely something trivial...
This is the failing test. It goes wrong when it gets into values.rb and tries to pass this condition. To be more exact, param_array contains String instead of Integer/Fixnum and I got honestly no clue why.

This gets resolved (and all tests pass) if I remake the condition to this:

unless (param_array.map { |n| n.to_s} - values.map { |n| n.to_s}).empty? 

However it leads to always comparing based on string representation. I see that coercion check is done before code reaches this validation but I am not sure it would be valid change.

@dblock could you please comment on it and point me in the right direction?

[dblock]

Before I answer this, is this even possible:

post '/foo', values: [1, 2, 3]

Imagine this is outside a client, you can POST JSON, some kind of parseable URI (eg. values[]=1&values[]=2&values[]=3), but not that, no?

[manovotn]

So you think that one test is pointless?
Are there other tests I should add then?

[dblock]

Right, I think it's not a realistic scenario, works only under RSpec.

[manovotn]

Ok, I removed the test case, fixed Rubocop offenses and rebased against upstream/master. Is it alright now?

[dblock]

Yes, this is good. Would you please squash your commits, too? I'll merge.

[manovotn]

Done.

[dblock]

Thanks, merged.