I generally prefer do blocks for making it really, really obvious that I'm doing silly things, and what the scope of that silliness actually is: 
my $bigseqnum = do {
    no warnings;
    int($seqnum) + 10000000
};

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Or, to be more explicit, no warnings 'numeric';

In reply to Re^2: Style and warnings by Tanktalus
in thread Style and warnings by api

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