This module exports two functions, "defer" and "lazy", for building
values that are evaluated on demand.
Unlike the "tie"-based Data::Lazy, this module operates on *values*, not
*variables*. Therefore, assigning into $dv and $lv above will simply
replace the value, instead of triggering a "STORE" method call.
WWW: http://search.cpan.org/dist/Scalar-Defer/
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