http://en.wikipedia.org/wiki/Type_safety http://en.wikipedia.org/wiki/Type_safety Aggressive type coercion is not type safety. It does not prevent type errors.

http://en.wikipedia.org/wiki/Type_safety http://en.wikipedia.org/wiki/Type_safety Aggressive type coercion is not type safety. It does not prevent type errors. It just sweeps them under the rug. 5 - 'foo' That's a type error. It's not a convenient shortcut for `NaN`.