map-set test is not representative

[sophiebits]

In the ES5 variant, the map test sets a fixed key on the object:

six-speed/tests/map-set/map-set.es5

Line 10 in dd4923f

map.foo = 'bar';

This means that VMs will optimize it with hidden class optimizations in a way that is useful for objects but not a fair comparison if you intend to use it as an actual hash map. It would be better to use a random string or one with special characters in it so that VMs treat the object as a hash map instead of an object (which they would do in any real-world situation that you might use a Map).

[kpdecker]

Care to put together some code we could talk about?