> The spec usually (always?) doesn't mention expected bounds Actually, I was just reading the other day that there are a few places where the specs do explicit

> The spec usually (always?) doesn't mention expected bounds Actually, I was just reading the other day that there are a few places where the specs do explicitly state expectations, such as performance characsteristics for Map/Set/WeakMap/WeakSet > Maps must be implemented using either hash tables or other mechanisms that, on average, provide access times that are sublinear on the number of elements in the collection. The data structure used in this specification is only intended to describe the required observable semantics of Maps. It is not intended to be a viable implementation model. https://tc39.es/ecma262/multipage/keyed-collections.html#sec-map-objects https://tc39.es/ecma262/multipage/keyed-collections.html#sec...