String.toCharArray() crashes if the string contains Swedish characters

A user reported a crash in my data field, and I eventually narrowed it down to a line of code that was calling toCharArray() on a user-provided string.  In this case, the string was "Östra Hällsjön".

A single umlauted character is enough to cause toCharArray() to crash.  For example:

var testStr = "Ö";
var chars   = testStr.toCharArray();

In the simulator, the debug console shows:

Error: System Error
Details: Failed invoking <symbol>
Stack: 
  - compute() at C:\dev
{filename}.mc:178 0x10000d9c 

The line number is the line with the call to toCharArray().  I have not done extensive testing to see what other characters may cause it to crash.

SDK:  6.2.2

Devices:  Epix2 51mm, Fenix 6X, Edge 1000