Just don't forget (even better, make it 'fingertip memory') to localize $/:

local $/ = \232;
...
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Update And as Roboticus knowingly pinpointed, I should mention here for completeness that the localization should be kept 'as local as possible', so maybe the code should look like

{
    local $/ = \232;
    while (<$input>) {
        ...
    }
}
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