Merge branch 'master' into jq/perf

Author: davidanthoff

src/enumerable/enumerable.jl

@@ -1,5 +1,6 @@
 abstract type Enumerable end
 
 Base.IteratorSize(::Type{T}) where {T <: Enumerable} = Base.SizeUnknown()
+IteratorInterfaceExtensions.isiterable(x::Enumerable) = true
 
-haslength(S) = Base.IteratorSize(S) isa Union{Base.HasLength, Base.HasShape} ? Base.HasLength() : Base.IteratorSize(S)
+haslength(S) = Base.IteratorSize(S) isa Union{Base.HasLength, Base.HasShape} ? Base.HasLength() : Base.IteratorSize(S)