[barrkel]

Ruby, Python, even PHP checks the types of values before executing operations on the values.

[keypusher]

That's not true, at least with Python. It uses duck typing, there is no type check before execution. It just runs the code you give it, if you try to call a method that doesn't exist (split on a integer), it will just give an error.

[rbanffy]

Exactly. They check the types. They don't burden the programmer with such tasks.