Hi, I think I've found a bug in the Ruby SDK. When the

hashAttribute

is an Integer, I'm receiving the following error:

/usr/local/bundle/gems/growthbook-0.2.0/lib/growthbook/context.rb:127:in `run': undefined method `length' for 123:Integer (NoMethodError)

      return get_experiment_result(exp) if hash_value.length.zero?
                                                     ^^^^^^^
	from /usr/local/bundle/gems/growthbook-0.2.0/lib/growthbook/context.rb:92:in `block in eval_feature'
	from /usr/local/bundle/gems/growthbook-0.2.0/lib/growthbook/context.rb:73:in `each'
	from /usr/local/bundle/gems/growthbook-0.2.0/lib/growthbook/context.rb:73:in `eval_feature'
	from /usr/local/bundle/gems/growthbook-0.2.0/lib/growthbook/context.rb:164:in `on?'
	from growthbook.rb:69:in `<main>'

That's is not happening with the Python SDK.

Thanks. In the other SDKs I think we cast the hashAttribute to a string before using. Should be an easy fix. I'll make sure to add an automated test case for this too.