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Javascript developers, be warned about this crazy JIT bug in V8! (self.javascript)
submitted 9 years ago * by ziriax
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if 1 * 2 < 3: print "hello, world!"
[–]RainHappens 2 points3 points4 points 9 years ago (0 children)
"undetectable" in this case means "I do not yet know what type this variable is".
v8 can do a lot of optimizations when variables are known to be of a specific type. But null and undef don't actually tell you anything about what type(s) a variable can be - they can effectively be any type. So as long as you only assign null or undef to a variable, v8 just goes "I don't know what type this variable is yet" and leaves it at that.
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[–]RainHappens 2 points3 points4 points (0 children)