undefined method `exclude?' for [JSON, [JSON]]:Array

[ericproulx]

While running benchmark/large_model locally, I stumbled upon this following error

 undefined method `exclude?' for [JSON, [JSON]]:Array

I ran the entire spec suite locally and I never faced the issue. After some investigation, I've figured that grape-entity is automatically loaded while running RSpec and it's requiring require 'active_support/core_ext/enumerable. Therefore, exclude? works on any enum. I'll create a PR to require it on our own.

[ericproulx]

Step to reproduce

1. add require: false to grape-entity in the Gemfile
2. run spec/grape/validations/validators/coerce_spec.rb:650 ( docker-compose run --rm --build grape rspec spec/grape/validations/validators/coerce_spec.rb:650)

[ericproulx]

It requires core_ext

[ericproulx]

By excluding grape-entity, some tests are failing. We're missing the following

require 'active_support/core_ext/object/deep_dup'
require 'active_support/core_ext/string/exclude'

A test is using second but I'll change it to [1] since its not use in the gem just in spec