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let prt;
const handleCall = e => {
const log = [];
for (let i = 0; i < e.data.length; ++i) {
if (!(e.data[i] in self))
log.push(e.data[i]);
}
prt.postMessage('These were missing: '+log.join(', '));
};
onconnect = e => {
prt = e.ports[0];
prt.onmessage = handleCall;
};