Chai does currently not handle typed arrays very well:
http://jsfiddle.net/7LbaveL6/

Typed Arrays have various uses but are usually big blobs of data (for example from canvas getImageData).

The problem with the way they are currently handled is that it causes the page to freeze when assertions are run on objects containing bigger typed arrays.

I looked at the code but wasn't sure where the right place for a fix would be.

In my opinion it would be ok to just output the to String representation of the typed array (by treating it like a primitive), but it could also use the array code path with proper truncation.