Typecheck Table.union (#3406)
Typecheck Table.union (#3406)

fixes #3404
cseed/hail,hail-is/hail,cseed/hail,danking/hail,danking/hail,hail-is/hail,danking/hail,hail-is/hail,danking/hail,hail-is/hail,cseed/hail,danking/hail,hail-is/hail,hail-is/hail,danking/hail,cseed/hail,danking/hail,hail-is/hail,cseed/hail,cseed/hail,cseed/hail,hail-is/hail,cseed/hail,danking/hail