Incorrect Integer Overflow Behavior

[chen-robert]

Version Information

Vyper has inconsistent behavior with numbers that exceed 2**256.

1. These values may be temporarily valid in the IR. This might create complexities for later optimization steps.
2. Sometimes values overflow and wrap around unexpectedly.

@external
def zzz(x: DynArray[uint256,36185027886661311069865932815214971204146870208012676262330495002472853012139]):
  y: uint256[7] = [0,0,0,0,0,0,0]

  y[6] = y[5]