Should logical operators always return booleans?

[gwhitney]

Currently they do. But in many languages, and of a number of arguments returns the first "falsy" argumen, or the last argument if they are all "truthy", whereas or of a number of arguments returns the first "truthy" argument, or the last argument if they are all "falsy". Here "falsy" means "converts to boolean false" and analogously for "truthy". For example, 2 or false would return 2 under this alternate convention. This alternative version of the logical operators can be very useful for producing concise formulas that filter out bad values, avoiding ternaries like x ? x : false and the like. If there was interest in adopting a revised convention, it would be a breaking change, but it would be convenient to implement it along with fixes to #3414.