libparams-validate-perl 0.91-1 (i386 binary) in ubuntu intrepid

 The Params::Validate module provides a flexible system for validating
 method/function call parameters. The validation can be as simple as
 checking for the presence of required parameters or as complex as
 validating object classes (via isa) or capabilities (via can),
 checking parameter types, and using customized callbacks to ensure
 data integrity.
 .
 The module has been designed to work equally well with positional or
 named parameters (via a hash or hash reference).
 .
 An attribute based implementation of this idea is also included as
 Attribute::Params::Validate, but it doesn't currently have all the
 features of the non-attribute version, and its use in production
 systems is not recommended.