• Added filename option to core-js-builder
• Map#merge updated per tc39/proposal-collection-methods@7da035b
• Collections .deleteAll method updated per tc39/proposal-collection-methods@0b91c07
• Array#{ flat, flatMap, lastIndex, lastItem } added to Array#@@unscopables per tc39/proposal-flatMap#75
• Fixed handling of $ in String#replace, #471