Querying for an object containing CodeWScope type yields:

> db.y.findOne()
Fri May 29 16:28:19 toval can't handle type: 15
Fri May 29 16:28:19 User Exception not done: toval
terminate called after throwing an instance of 'mongo::UserException'
what(): not done: toval
Fri May 29 16:28:19 mongo got signal 6 (Aborted), stack trace:
Fri May 29 16:28:19 0x8056c40 0xb7f3e400 0xb7f3e430 0xb7b608a0 0xb7b62268 0xb7edd778 0xb7edb655 0xb7edb692 0xb7edb7ca 0x8064843 0x8090df5 0x808afaf 0xb7d796f8 0xb7d79c85 0xb7d71bf2 0xb7d60a19 0xb7d702e8 0xb7d2bcb1 0xb7d2bd5f 0xb7d2f5c3
./mongo(_Z12quitAbruptlyi+0x4e0) [0x8056c40]
[0xb7f3e400]
[0xb7f3e430]
/lib/tls/i686/cmov/libc.so.6(gsignal+0x50) [0xb7b608a0]
/lib/tls/i686/cmov/libc.so.6(abort+0x188) [0xb7b62268]
/usr/lib/libstdc++.so.6(ZN9gnu_cxx27_verbose_terminate_handlerEv+0x158) [0xb7edd778]
/usr/lib/libstdc++.so.6 [0xb7edb655]
/usr/lib/libstdc++.so.6 [0xb7edb692]
/usr/lib/libstdc++.so.6 [0xb7edb7ca]
./mongo [0x8064843]
./mongo [0x8090df5]
./mongo [0x808afaf]
/usr/lib/libmozjs.so.0d [0xb7d796f8]
/usr/lib/libmozjs.so.0d(js_LookupProperty+0x35) [0xb7d79c85]
/usr/lib/libmozjs.so.0d [0xb7d71bf2]
/usr/lib/libmozjs.so.0d [0xb7d60a19]
/usr/lib/libmozjs.so.0d [0xb7d702e8]
/usr/lib/libmozjs.so.0d(JS_EvaluateUCScriptForPrincipals+0xa1) [0xb7d2bcb1]
/usr/lib/libmozjs.so.0d(JS_EvaluateUCScript+0x4f) [0xb7d2bd5f]
/usr/lib/libmozjs.so.0d(JS_EvaluateScript+0x73) [0xb7d2f5c3]