Maximum call stack size exceeded error with merge sort function

[javagar]

Because the function receives the data via a parameter and also operates on that data via an external variable, it is difficult to keep track of what the function is doing.

EDIT (March 29, 2021):

@micuat

it would be helpful if you can provide the complete code with what array you are using etc so we can actually run it

@michaelberge, if you can provide us with that code, we would be in a better position to understand the relationship between the function and the data, and to diagnose the problem.