Fix error when very large numbers are typed into blocks (#921)
Fix error when very large numbers are typed into blocks (#921)


switchinnovations/pxt,Microsoft/pxt,switch-education/pxt,Microsoft/pxt,playi/pxt,switch-education/pxt,switch-education/pxt,switchinnovations/pxt,switch-education/pxt,switch-education/pxt,Microsoft/pxt,playi/pxt,Microsoft/pxt,switchinnovations/pxt,playi/pxt,switchinnovations/pxt,playi/pxt,Microsoft/pxt