I have always hated the legacy error suppression in src/Utility/MimeMailFormatHelper.php, where we use @ to hide errors that occur when exploding a URL into two parts and assigning those parts to a variables using list(). When the explode doesn't produce two parts, a PHP error occurs, which needs to be suppressed.
Using @ in this way also leads to the one Phpstan error in our tests.
So this issue is to find an alternative way to code this without the use of @.
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