A binary value: either true or false. These values are case sensitive. If no default value is specified, a Boolean type defaults to a value of false.
In the Tinderbox UI, Boolean attributes my often be represented as tick-boxes. A ticked box equates to true, and and empty box to false.
From v6.3.0, when coercing a Boolean value- such as an expression result - to Number-type of data, true coerces to 1 and false coerces to 0 (zero).