What are common pitfalls or gotchas with type constraints?

Understanding type constraints in Perl can help avoid common pitfalls and ensure code reliability. This section highlights common mistakes programmers make when applying type constraints.

Perl, type constraints, programming pitfalls, data validation, code reliability

<![CDATA[ package MyClass; use Moose; # Incorrect usage of type constraint has 'age' => ( is => 'rw', isa => 'Int', # Should be defined using 'Mouse::Util::TypeConstraints' required => 1, ); # Correct usage with a custom type constraint use Moose::Util::TypeConstraints; subtype 'PositiveInt', as 'Int', where { $_ > 0 }, message { "${$_} is not a positive integer" }; has 'age' => ( is => 'rw', isa => 'PositiveInt', # Custom defined type constraint required => 1, ); # Potential mistake: not validating inputs my $person = MyClass->new(age => 25); # Fine my $invalid_person = MyClass->new(age => -5); # Throws error ]]>

Perl type constraints programming pitfalls data validation code reliability

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