Data::Util::Error - Deals with class-specific error handlers in Data::Util

	package Foo;
	use Data::Util::Error sub{ Foo::InvalidArgument->throw_error(@_) };
	use Data::Util qw(:validate);

	sub f{
		my $x_ref = array_ref shift; # Foo::InvalidArgument is thrown if invalid
		# ...
	}

Data::Util::Error->fail_handler()

Data::Util::Error->fail_handler($handler)

Data::Util::Error::croak(@args)

Data::Util.