Env HUGO_DISABLELANGUAGES is not working after v0.111.3 with multiple values

[dbaio]

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

$ hugo version
hugo v0.112.0+extended freebsd/amd64 BuildDate=2023-07-20T22:16:20Z-0300 VendorInfo=freebsd

and

$ hugo version
hugo v0.115.4+extended freebsd/amd64 BuildDate=2023-07-20T22:31:17Z-0300 VendorInfo=freebsd

Does this issue reproduce with the latest release?

yes

---

Behavior with v0.111.3:

$ hugo version
hugo v0.111.3+extended freebsd/amd64 BuildDate=2023-03-17T03:01:46Z+0000 VendorInfo=freebsd

$ HUGO_DISABLELANGUAGES=" bn-bd da de el es fr hu id it ja ko mn nl pl ru tr zh-cn zh-tw" hugo config | grep -i disablelanguage
disablelanguages: "bn-bd da de el es fr hu id it ja ko mn nl pl ru tr zh-cn zh-tw"

$  HUGO_DISABLELANGUAGES="fr es" hugo config | grep -i disablelanguage
disablelanguages: "fr es"

And now with v0.112.0 and v0.115.4:

$  hugo version
hugo v0.112.0+extended freebsd/amd64 BuildDate=2023-07-20T22:16:20Z-0300 VendorInfo=freebsd

$ HUGO_DISABLELANGUAGES=" bn-bd da de el es fr hu id it ja ko mn nl pl ru tr zh-cn zh-tw" hugo config | grep -i disablelanguage
disablelanguages = ['bn-bd da de el es fr hu id it ja ko mn nl pl ru tr zh-cn zh-tw']

$ HUGO_DISABLELANGUAGES="fr es" /usr/local/bin/hugo config | grep -i disablelanguage
disablelanguages = ['fr es']

$ hugo version
hugo v0.115.4+extended freebsd/amd64 BuildDate=2023-07-20T22:31:17Z-0300 VendorInfo=freebsd

$ HUGO_DISABLELANGUAGES=" bn-bd da de el es fr hu id it ja ko mn nl pl ru tr zh-cn zh-tw" hugo config | grep -i disablelanguage
disablelanguages = ['bn-bd da de el es fr hu id it ja ko mn nl pl ru tr zh-cn zh-tw']

$ HUGO_DISABLELANGUAGES="fr es" /usr/local/bin/hugo config | grep -i disablelanguage
disablelanguages = ['fr es']

The intended behavior should be disableLanguages = ['fr', 'es'], right?
This other way, hugo is building all languages every time.

[jmooring]

With v0.112.0 and later...

PASS - Disable multiple languages in site configuration via language object

[languages.en]
weight = 1

[languages.de]
disabled = true
weight = 2

[languages.fr]
disabled = true
weight = 3

PASS - Disable multiple languages in site configuration via root setting

disableLanguages = ['de', 'fr']

PASS - Disable a single language via environment variable

HUGO_DISABLELANGUAGES="de" hugo

FAIL - Disable multiple languages via environment variable

HUGO_DISABLELANGUAGES="de fr" hugo

---

We have the same failure with...

HUGO_DISABLEKINDS="RSS taxonomy term sitemap" hugo

The above worked prior to v0.112.0.

[dbaio]

With v0.112.0 and later...

This works (disables a single language):

HUGO_DISABLELANGUAGES="de" hugo

This does not (does not disable any language):

HUGO_DISABLELANGUAGES="de fr" hugo

I've changed the PR title to 'is not working with multiple values'. Thanks.

[github-actions]

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