Ah. Well, according to the documentation of my:

my TYPE expression

The exact semantics and interface of TYPE and ATTRS are still evolving. TYPE is currently bound to the use of 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.

In reply to Re^3: Specifying the class of an object in the declaration by ELISHEVA
in thread Specifying the class of an object in the declaration by FalseVinylShrub

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