issetequal doesn't check IteratorSize

[davidanthoff]

This method kicks in for arbitrary iterables. It shouldn't just call length therefor, but instead first check IteratorSize, and then fall back on some other implementation if it returns SizeUnknown().

[laborg]

This has been changed in the meantime (#32826):

julia/base/abstractset.jl

Lines 439 to 443 in cc345f6

	function issetequal(a, b)
	haslength(a) && return issetequal(a, Set(b))
	haslength(b) && return issetequal(b, Set(a))
	return issetequal(Set(a), Set(b))
	end