Custom plugins

Feature	Type	TC39	CoreJS	Babel	Civet
Chained comparisons	Runtime	❌		❌	✅
Iterator chunking	Polyfill	✅ Stage 2.7	✅	❌	❌
Math.clamp	Polyfill	✅ Stage 2	✅	❌	❌
Negative array subscript	Runtime	✅ Stage -1		❌	❌
Object property count	Polyfill	✅ Stage 1	❌	❌	❌
Promise await dictionary	Polyfill	✅ Stage 2.7	❌	❌	❌
Promise.isPromise	Polyfill	✅ Stage 2	❌	❌	❌
Random	Polyfill	✅ Stage 1	❌	❌	❌
Typeof null operator	Runtime	✅ Stage -1		❌	❌