These are two boolean types available in Pliant:
Bool single byte boolean
CBool processor size boolean (equivalent to C booleans)

a or b

a and b

not a

Please notice that the 'b' argument will be evaluated only if the final result depends on it's value.

a = b

a <b

a < b

a > b

a <b

a >b

these comparisons are available for integers, floating point numbers, strings, and potentially many other data types.