Specification 3.3 is incorrect.

[python-processing-unit]

According the specification section 3.3:

Conditions MUST accept INT, STR, and TNS. A STR condition MUST first be converted using the language's INT conversion rules. A TNS condition MUST be treated as true if any contained element is truthy and false otherwise.

This is incorrect. Conditions MUST accept all types, and coerces them to their boolean representation.