throw if not given a symbol as first argument
throw if not given a symbol as first argument

JakeChampion/polyfill-service,kdzwinel/polyfill-service,mcshaz/polyfill-service,JakeChampion/polyfill-service,jonathan-fielding/polyfill-service,jonathan-fielding/polyfill-service,jonathan-fielding/polyfill-service,mcshaz/polyfill-service,kdzwinel/polyfill-service,kdzwinel/polyfill-service,mcshaz/polyfill-service