I like it!

Meaningless 'optimization'/alternate style: I like to do my defaults right when I declare the variables; not that it matters much here, but just as a 'grace note':

my $size = shift || 30;
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Also,

 return unless defined $data;
   $data;
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in your get method will return undef if $data is not defined (at least, if the sub's been called in a scalar context, which it will be, right?), so you could probably just get rid of that first line.

well, I guess it saves a few keystrokes too ... heh.

Philosophy can be made out of anything. Or less -- Jerry A. Fodor