Optional boolean that is not present returns nil

[amclain]

In the case of the following spec, it would be expected that if param1 is not present, the value would be nil (currently it is coerced to false). In this case, true/false/nil makes it easy to detect if the value was present, and is easy to "coerce" after validation with if (data.param1) or !!param1.

attribute :param1, :boolean, optional: true

If the intent is to use spec to coerce an optional property to only true/false, use default:

attribute :param1, :boolean, default: false