union, complement, symdiff, and intersect not working with resource collections

[rnwst]

Description

As per the title, the set methods provided for collections do not seem to work with global resources. For example:

{{- $styles := resources.Match "css/**.css" }}
{{- $katex := resources.Match "css/**katex*" }}
{{- $complement := complement $katex $styles }}

Here, $complement contains all resources from $styles, not excluding those also found in $katex. The functions union, symdiff, and intersect malfunction in similar ways. intersect seems to return an empty collection, irrespective of the resource collections provided.

What version of Hugo are you using (hugo version)?

$ hugo version
hugo v0.140.0+extended linux/amd64 BuildDate=unknown

[jmooring]

To clarify, this works fine:

{{ $a := resources.Get "a.jpg" }}
{{ $b := resources.Get "b.jpg" }}
{{ $c := resources.Get "c.jpg" }}
{{ $d := resources.Get "d.jpg" }}

{{ $abcd := slice $a $b $c $d }}
{{ $cd := slice $c $d}}

{{ $abcd | complement $cd }}

But these do not:

{{ $match := resources.Match "*" }}
{{ $match | complement $cd }}

{{ $byType := resources.ByType "image"}}
{{ $byType | complement $cd }}

The problem occurs when working with the collections created by resources.Match and resources.ByType.

[github-actions]

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