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## Type Constraints

Moo has no built-in type system. `isa` takes a coderef:

```perl
use Types::Standard qw(Str Int ArrayRef);
has name => (is => 'ro', isa => Str);
has tags => (is => 'ro', isa => ArrayRef[Str], default => sub { [] });
```

`Type::Tiny` / `Types::Standard` is the official recommendation in Moo docs (replaces `MooseX::Types`).

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## Decision Guide

| Situation | Use |
|---|---|