in lib/core/filtering/simple_rules/simple_rule.rb [154:159]
def to_bool(str)
return true if str == true || str =~ (/^(true|t|yes|y|on|1)$/i)
return false if str == false || str.blank? || str =~ (/^(false|f|no|n|off|0)$/i)
raise ArgumentError.new("invalid value for Boolean: \"#{str}\"")
end