The exact semantics and interface of TYPE and ATTRS are still evolving. TYPE may be a bareword, a constant declared with
use constant , or
__PACKAGE__. It is currently bound to the use of the
fields pragma, and attributes are handled using the
attributes pragma, or starting from Perl 5.8.0 also via the
Attribute::Handlers module. See Private Variables via my() in perlsub for details, and fields, attributes, and Attribute::Handlers.
Note that with a parenthesised list,
undef can be used as a dummy placeholder, for example to skip assignment of initial values:
my ( undef, $min, $hour ) = localtime;
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