Use a do block to limit the scope: 

$s = "\x{100}";;
print do{ use bytes; length $s } . ' : ' .  length $s;;

2 : 1

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In the absence of evidence, opinion is indistinguishable from prejudice.

In reply to Re^3: Another use bytes and length issue by BrowserUk
in thread Another use bytes and length issue by zubster

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