Add tests to ensure that undefined and float values are passed through.
Add tests to ensure that undefined and float values are passed through.

decaffeinate/decaffeinate,alangpierce/decaffeinate,greyhwndz/decaffeinate,alangpierce/decaffeinate,netei/decaffeinate,edi9999/decaffeinate,eventualbuddha/decaffeinate,alangpierce/decaffeinate,netei/decaffeinate,lunks/decaffeinate,eventualbuddha/decaffeinate,decaffeinate/decaffeinate,lunks/decaffeinate