expressions: teach short-circuit evaluation of && and || - #4
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Adds a Short-Circuit Evaluation section to the Comparison and Logical Operators chapter: the right operand of
&&/||is evaluated only when the left operand does not determine the result, with the divisor-guard and bounds-guard idioms as examples, and a pointer to the bitwise operators for unconditional evaluation.Matches the compiler as of Inferara/inference#309 and the spec as of Inferara/inference-language-spec#30.