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Test of boolean expressions
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Non-zero numerics, non-empty strings, and the true boolean have an EBV of true
Zero-valued numerics, the empty string, and the false boolean have an EBV of false
The && operator takes the EBV of its operands
| The | operator takes the EBV of its operands |
The EBV of an unbound value or a literal with an unknown datatype is a type error, which eliminates the solution in question
Negating a type error is still a type error