MooX::Struct allows you to create cheap struct-like classes for your data
using the Moo manpage.

While similar in spirit to the MooseX::Struct manpage and the Class::Struct
manpage, MooX::Struct has a somewhat different usage pattern. Rather than
providing you with a 'struct' keyword which can be used to define structs,
you define all the structs as part of the 'use' statement. This means they
happen at compile time.

A struct is just an "anonymous" Moo class. MooX::Struct creates this class
for you, and installs a lexical alias for it in your namespace. Thus your
module can create a "Point3D" struct, and some other module can too, and
they won't interfere with each other. All struct classes inherit from
MooX::Struct.