in reply to require and use strict vars
Also possible (since There's More Than One Way To Do It):
require Data::Dumper; no warnings 'once'; local $Data::Dumper::Indent = 0; use warnings 'once';
If the local is in a sufficiently-small scope, omit the use warnings.
Shameless plug: See also My Favorite Warnings: once.
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Seekers of Perl Wisdom