no implicit conversion of nil into String (TypeError) in reflect.rb

[jcohenho]

If you use anything that requires architect/functions inside a Ruby lambda you get the following error:
vendor/bundle/ruby/2.7.0/gems/architect-functions-0.5.3/lib/architect/reflect.rb:10:in +': no implicit conversion of nil into String (TypeError)`

I'm assuming it's because there is no ENV['ARC_CLOUDFORMATION'] variable set from reflect.rb: https://github.com/architect/functions-ruby/blob/main/lib/architect/reflect.rb#L10

Is there documentation on how to use and set this env variable?

Update: The error disappears if I add ARC_CLOUDFORMATION '' to the testing block in preferences.arc, probably this line should be an interpolated string instead of a + operator.

Update 2: This env var is actually deprecated