Size of StaticArray type

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Assessment

Difficulty
4/5
Estimated time
3-5 days
Newbie friendliness
32/100
Issue type
Bug
Clarity
Needs clarification
Activity status
Stale
Tech stack
julia
Domain
tooling

Research direction

Reproduce the Julia examples using ArrayInterface.known_size, ArrayInterface.size, StaticArray, and StaticArrays, then inspect the IteratorSize-related dispatch involved in those entry points. Done means the expected behavior for type-level dimensions and unknown dimensions is decided, documented by regression tests, and any needed StaticArrays report is filed.

Written by the indexing model from the issue text.

Description

Using ArrayInterface v5.05 and StaticArrays v1.42:

julia> import ArrayInterface as Arr

julia> using StaticArrays

julia> Arr.known_size(SArray{Tuple{2,3}})
(6,)

julia> Arr.size(StaticArray{Tuple{2,3}})
(static(6),)

Are those the intended results? I expected (2, 3) and (static(2), static(3)), respectively. (Though, things work fine for instances of StaticArrays.)

I think what is happening is that IteratorSize(::Type{<:StaticArray}) is defaulting to HasLength() while it might better off be HasShape{N}(), so the wrong method gets called at some point. If that's the case, perhaps its also worth opening a bug report on StaticArrays.

Also, should ArrayInterface.size produce an error if given a Type as an argument? What should be the behavior if one of the dimensions is unknown?

Dominant language
Julia
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