Mongo fails to round-trip the date before epoch when inserted via shell:

> t = db.date1;
> t.drop();
> var d = new Date(-1);
> t.save(

);
> assert.eq(d, t.findOne().d, "Should be equal");
assert: ["Wed Dec 31 1969 23:59:59 GMT+0000 (BST)"] != ["Tue Jan -2147483647 584556020 15:25:52 GMT+0100 (BST)"] are not equal : Should be equal

Reproducible on OS X version 1.2.4 32/64-bit, 1.4.0/64, 1.4.1-pre/64, 1.5.0-pre and on Windows 1.4.0 32-bit.