freebsd-ports/devel/p5-Specio/pkg-descr
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The Specio distribution provides classes for representing type constraints and
coercion, along with syntax sugar for declaring them.
Note that this is not a proper type system for Perl. Nothing in this
distribution will magically make the Perl interpreter start checking a value's
type on assignment to a variable. In fact, there's no built-in way to apply a
type to a variable at all.
Instead, you can explicitly check a value against a type, and optionally coerce
values to that type.
The author's long-term goal is to replace Moose's built-in types and
MooseX::Types with this module.
WWW: https://metacpan.org/release/Specio