Implement overflow semantics for signed byte and signed short
Fix Reference.Of using assignment to declare __Type__ instead of defining a property
Checkpoint work on introducing support for ES7 typed objects
Checkpoint introduction of ES7 typed objects support
Make __proto__/setPrototypeOf optional and turn it off by default because it is *incredibly* slow
Split SimpleTestCases out from the rest of the test cases so test runners can run them in parallel with the other test groups
Checkpoint
Added tests for Nullable issues. (See #316, #361).
Various nullable-related bug fixes
More nullable fixes
Enum->Integer casts work at runtime now
Backed out changeset: 44e73ab14918
Backed out changeset: 2b2322354c5a
Backed out changeset: b6ea5511a76c
Backed out changeset: e6204a5a66da
Backed out changeset: db4578ca5ed0
Merge with master Nullable fix.