# Why? isa(\[(x,1),(y,1)\], Array{Tuple{Stuff,Number},1}) = false

**URL:** https://discourse.julialang.org/t/why-isa-x-1-y-1-array-tuple-stuff-number-1-false/55777
**Category:** General Usage
**Created:** [February 22, 2021, 1:49pm UTC](https://discourse.julialang.org/t/why-isa-x-1-y-1-array-tuple-stuff-number-1-false/55777 "2021-02-22T13:49:54Z")
**Posts on this page:** 1
**Showing post:** 2

<div class="post-metadata">

### Author: ![goretkin](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/goretkin/32/167_2.png) [@goretkin](https://discourse.julialang.org/u/goretkin)
#### Post date: [February 22, 2021, 1:56pm UTC](https://discourse.julialang.org/t/why-isa-x-1-y-1-array-tuple-stuff-number-1-false/55777/2 "2021-02-22T13:56:36Z")

</div>

Related: [Why are tuples covariant?](https://discourse.julialang.org/t/why-are-tuples-covariant/45005)

Consider

```julia
test4 = isa([(x,1),(y,1)], Array{<:Tuple{Stuff, Number},1})

```

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