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 my($value) = map { defined() ? $_ : 1 } getConfigValue( "use_foo" );

my $value = do { defined(local $_ = getConfigValue( "use_foo" )) ? $_ 
+: 1 };

sub default {
     my $v = shift;
...
}

my $value = default(getConfigValue( "use_foo" ), 1);