it's not necessarily that I want it to be any more generic than promises or arrays, I just have an aversion to flat() on principle unless it's essentially flatMap(id)
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Have you seen how an array’s length property is defined? https://www.ecma-international.org/ecma-262/5.1/#sec-15.4 … tl;dr it looks at properties on the object, determines which are array indexes, adds one to the largest, and bam, length.
> object has a length property whose value is always a nonnegative integer I'm pretty sure this is for a different language
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I mean, it’s a Number but it can also be a non-negative integer
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"The language spec has the concept of integers you just don't get to use them"
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