Crash on basic example

[newobj]

const p = new PriorityQueue(function (a, b) {
    return a.value < b.value;
  });
p.push({ text: 'a', value: 2 });
p.push({ text: 'b', value: 7 });
p.push({ text: 'c', value: 4 });
p.push({ text: 'd', value: 1 });
p.push({ text: 'e', value: 8 });
p.push({ text: 'f', value: 1 });
p.pop();
p.pop();
p.pop();
p.pop();

I took the sample comparator code, and added a few pops to the end of the code. This crashes with an undefined value for 'b' being fed into the comparator.

error: Uncaught TypeError: Cannot read properties of undefined (reading 'value')
    return a.value < b.value;
                       ^
    at PriorityQueue._comparator (file:///C:/....ts:78:24)
    at PriorityQueue._compare (file:///C:/Users/newob/AppData/Local/deno/npm/registry.npmjs.org/p-queue-ts/1.2.0/dist/index.js:163:25)
    at PriorityQueue._heapify (file:///C:/Users/newob/AppData/Local/deno/npm/registry.npmjs.org/p-queue-ts/1.2.0/dist/index.js:137:22)
    at PriorityQueue.pop (file:///C:/Users/newob/AppData/Local/deno/npm/registry.npmjs.org/p-queue-ts/1.2.0/dist/index.js:72:14)
    at ... (file:///C:/....ts:90:5)  

[newobj]

Another repro here: https://runkit.com/embed/y58vzvccq7ki