This can remove unwanted params from your POST reqs.
Add this to your applications Gemfile:
gem 'rack-remove-param'
And run:
$ bundle
In config/application.rb
config.middleware.insert 'Rack::RemoveParam', 'should_group_accessibility_children'
Where 'should_group_accessibility_children' is the param you want to filter.
To filter multiple params:
In config/application.rb
config.middleware.insert 'Rack::RemoveParam', ['param1', 'param2']
Where 'param1' & 'param2' are the params you want to filter.