can.Map stack exceeded on circular data structures

[zkat]

Summary

If you pass a circular object to can.Map, it'll blow the stack.

Steps

1. Create a circular JS object by assigning a reference of itself to it.
2. Pass it to can.Map
3. watch the fireworks (in your console)

Notes

There's an example of the effects of this here: http://jsfiddle.net/NMBMh/2/.

[justinbmeyer]

This is partially because

foo = {}
foo.foo = foo;
$.extend(true,{}, foo)

breaks. This might result in a won't fix as it would require replacing some jQuery functionality with our own. It does support circular structures, just not on initialization.