No support for bit operations

[ndmitchell]

From the spec:

Bitwise operations:
  int ^ int                    # bitwise XOR
  int & int                    # bitwise AND
  int | int                    # bitwise OR
  int << int                   # bitwise left shift
  int >> int                   # bitwise right shift (arithmetic)

Plus:

~ number        unary bitwise inversion (int)

We don't support these operations.

[ndmitchell]

This landed, so one spec violation down!