export function not expanding tilde

[atusy]

export and set -gx behaves differently on tilde expansion.
I think export should also expand tilde.

> export x=~
> echo $x
~
> set -gx y ~
> echo $y
/home/atusy

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• Fish: 3.7.1
• OS: Manjaro Linux
• Terminal: Wezterm

[atusy]

Sorry, it's duplicate of #5793

I missed looking at closed issues