TypedArray objects no longer born non-extensible (rev19)
Remove [[Enumerable]] check from MixinProperties per comment from AWB
Also copy [[Constructor]] state when rebinding functions
Make AssignmentExpression optional for YieldExpression (rev19)
Move 'yield' token to reserved words (rev19)
Normalise line endings in TemplateLiterals (rev19)
Update production rules comment for Comprehension (rev19)
Remove HasProperty() checks from destructuring evaluation (rev19)
Add some fixme's for unsolved spec issues