Reduce allowed input types for unchecked cast
Change remaining use of @@<name> to Symbol.<name>
Update [[Description]] for well-known symbols (rev20)
Remove no longer needed method
Move function name tests
Update Function Declaration Instantiation, also change legacy function .arguments (rev20)
Remove no longer needed wrapper call to RegExpCreate
Add tests for legacy function .arguments
Move disabled tests to correct category
Update README.md - now at rev20