[Question] Is there a maximum path cost for a_star_search() before it gives up?

I'm using `a_star_search()` to dig corridors between rooms, and set the cost of each tile between `1.0` and `100.0` (the external walls are `f32::MAX`).

I noticed the function often fails to connect 2 rooms together, and the issue solves itself when I adjust the costs between `0.1` and `10.0`. So it's not really an issue as the result is visually identical, but I spent quite some time finding the root cause of it.