The use of || operator in assignments

In the topic 15.7 this kind of assignment is favored over ternaries: `const foo = a || b;`. Actually, this pattern is used in a lot of the examples, but should it be discouraged since it can produce undesired behavior when the left operand is falsy? In the above example if `a` is falsy so `b` would be the result.

I know the developer should distinguish problematic cases, but one of the goals of the style guide is to avoid potential issues.

Start with topic 15.7 and the examples using `const foo = a || b;`, then review how JavaScript treats falsy left operands. Determine whether the style guidance needs clarification or revision; the work is done when the guidance clearly addresses cases where `||` can produce an unintended value.

Written by the indexing model from the issue text.