Add support for strings as key

[nermin99]

priorityQueue.push("x,y", 10)
priorityQueue.push("a", 20)
console.log(priorityQueue.pop())    // 0
console.log(priorityQueue.peek())   // 0

The output should be

"x,y"
"a"

I want to use Dijkstra's algorithm on a 2D-array grid. Using indexes as keys and the number value at that position as weight.

[luciopaiva]

I'm pretty sure you were doing AoC21 day 15 when you requested this, am I right? 😂

Your request makes total sense. I do want to introduce support for keys of types other than numbers, but that will impose a speed penalty since I won't be able to use typed arrays anymore, which is what makes Heapify so fast. Anyway, I do think that Heapify should evolve towards better usability, even if it means sacrificing eficiency, so I think this is worth doing. We should see this change by the time v1.0 is released.

Thanks for your sugestion.