That's specializing on type, not on a given specific value. Being JS the value influences the type, but it's only looking at a coarse binning (int vs. double vs

That's specializing on type, not on a given specific value. Being JS the value influences the type, but it's only looking at a coarse binning (int vs. double vs. string etc..) not specializing for a single specific value. A form of de-virtualization if you will. Hotspot wouldn't even need to bother with that most of the time since it's primarily running statically typed languages for which that doesn't apply in the first place.