* NEW: UNSAFE is a new keyword used in conjunction with FAST. It tells the JIT compiler not to do any safety check (null objects, division by zero, out of array bounds...). It makes the code a bit faster, but prone to segmentation fault.

[INTERPRETER]
* NEW: Support for the UNSAFE keyword.

[GB.JIT]
* NEW: Support for the UNSAFE keyword.
* NEW: Check validity of objects that can be invalid.