Clarify Set([iterable]) versus new Set(list, of, items)

[ljharb]

The spec is clear but inconsistent on Set([1, 2, 3]) versus Set(1, 2, 3) versus new Set([1, 2, 3]) versus new Set(1, 2, 3) - specifically, how many items do each of these have?

The current spec seems to indicate the answers are 3, TypeError, 1, and 3, respectively.

[domenic]

My understanding is that you can't call Set as a function, and that trying to pass the constructor a non-iterable object will throw. So that would give TypeError, TypeError, 3, TypeError. Can check spec to confirm...

[ljharb]

Cleared it up - I misunderstood some of the spec WebIDL language. I'll clear up the TypeError messages in the shim so this is clearer.