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function jade_escape(str){return str}
function jade_classes_old(val, escaping) {
if (Array.isArray(val) && Array.isArray(escaping)) {
return jade_classes_old(val.map(jade_classes_old).map(function (cls, i) {
return escaping[i] ? jade_escape(cls) : cls;
}));
}
return (Array.isArray(val) ? val.map(jade_classes_old) :
(val && typeof val === 'object') ? Object.keys(val).filter(function (key) { return val[key]; }) :