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  1. or download this
    my @decoded = unpack '...', substr $bigscalar, $offset, $size;
    
    ...
    
    # or
    substr( $bigscalar, $offset, $size ) = pack '...', @newValues;
    
  2. or download this
    my $replacement = pack '...', @newValues;
    
    substr( $bigScalar, $offset, length $replacement ) = $replacement;
    
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    ## Create a scalar
    perl> $bigScalar = 'the quick brown fox jumps over the laxy dog';;
    ...
    ## The typo is now corrected.
    perl> print $bigScalar;;
    the quick brown fox jumps over the lazy dog