allof expression term evaluates as true if all of the grouped expressions
also evaluated as true. For example, this expression matches only files whose
name ends with
.txt and that are not empty files:
["allof", ["match", "*.txt"], ["not", "empty"]]
Each array element after the term name is evaluated as an expression of its own:
["allof", expr1, expr2, ... exprN]
Evaluation of the subexpressions stops at the first one that returns false.