Type information is used in JS engines to compile into native code. If type information is too vague or change you can have deoptimization[0] [0]http://jayconr

Type information is used in JS engines to compile into native code. If type information is too vague or change you can have deoptimization[0] [0]http://jayconrod.com/posts/54/a-tour-of-v8-crankshaft-the-optimizing-compiler http://jayconrod.com/posts/54/a-tour-of-v8-crankshaft-the-op...