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C<< $Aion::Type::SELF-E<gt>{N} >> equivalent to C<N> in context of C<Aion::Types>.

=head2 validate ($element, $feature)

Checks C<$element> and throws a C<detail> message if the element does not belong to the class.

	my $PositiveInt = Aion::Type->new(
		name => "PositiveInt",
		test => sub { /^\d+$/ },
	);
	
	eval {
		$PositiveInt->validate(-1, "Neg")
	};
	$@ # ~> Neg must have the type PositiveInt. The it is -1

=head2 val_to_str ($val)

Converts C<$val> to a string.

	Aion::Type->new->val_to_str([1,2,{x=>6}]) # => [1, 2, {x => 6}]

=head2 instanceof ($type)

Specifies that a type is a subtype of another C<$type>.

	my $int = Aion::Type->new(name => "Int");
	my $positiveInt = Aion::Type->new(name => "PositiveInt", as => $int);
	
	$positiveInt->instanceof($int)          # -> 1
	$positiveInt->instanceof($positiveInt)  # -> 1
	$positiveInt->instanceof('Int')         # -> 1
	$positiveInt->instanceof('PositiveInt') # -> 1
	$int->instanceof('PositiveInt')         # -> ""
	$int->instanceof('Int')                 # -> 1

=head2 make ($pkg)

Creates a subroutine with no arguments that returns a type.

	BEGIN {
		Aion::Type->new(name=>"Rim", test => sub { /^[IVXLCDM]+$/i })->make(__PACKAGE__);
	}
	
	"IX" ~~ Rim	 # => 1

The C<init> property cannot be used with C<make>.

	eval { Aion::Type->new(name=>"Rim", init => sub {...})->make(__PACKAGE__) }; $@ # ~> init_where won't work in Rim

If the routine cannot be created, an exception is thrown.

	eval { Aion::Type->new(name=>"Rim")->make }; $@ # ~> syntax error

=head2 make_arg ($pkg)

Creates a subroutine with arguments that returns a type.

	BEGIN {
		Aion::Type->new(name=>"Len", test => sub {
			$Aion::Type::SELF->{args}[0] <= length($_) && length($_) <= $Aion::Type::SELF->{args}[1]
		})->make_arg(__PACKAGE__);
	}
	
	"IX" ~~ Len[2,2] # => 1

If the routine cannot be created, an exception is thrown.

	eval { Aion::Type->new(name=>"Rim")->make_arg }; $@ # ~> syntax error

=head2 make_maybe_arg ($pkg)

Creates a subroutine with arguments that returns a type.

	BEGIN {
		Aion::Type->new(
			name => "Enum123",
			test => sub { $_ ~~ [1,2,3] },
			a_test => sub { $_ ~~ $Aion::Type::SELF->{args} },
		)->make_maybe_arg(__PACKAGE__);
	}
	
	3 ~~ Enum123        # -> 1
	3 ~~ Enum123[4,5,6] # -> ""
	5 ~~ Enum123[4,5,6] # -> 1

If the routine cannot be created, an exception is thrown.

	eval { Aion::Type->new(name=>"Rim")->make_maybe_arg }; $@ # ~> syntax error

=head2 equal ($type)

Types are equal if they have the same name, the same number of arguments, the parent element, and the arguments are equal.

	my $Int = Aion::Type->new(name => "Int");
	my $PositiveInt = Aion::Type->new(name => "PositiveInt", as => $Int);
	my $AnotherInt = Aion::Type->new(name => "Int");
	my $IntWithArgs = Aion::Type->new(name => "Int", args => [1, 2]);
	my $AnotherIntWithArgs = Aion::Type->new(name => "Int", args => [1, 2]);
	my $IntWithDifferentArgs = Aion::Type->new(name => "Int", args => [3, 4]);
	my $Str = Aion::Type->new(name => "Str");
	
	$Int->equal($Int)                        # -> 1
	$Int->equal($AnotherInt)                 # -> 1
	$IntWithArgs->equal($AnotherIntWithArgs) # -> 1
	$PositiveInt->equal($PositiveInt)        # -> 1
	
	$Int->equal($Str)                          # -> ""
	$Int->equal($IntWithArgs)                  # -> ""
	$IntWithArgs->equal($IntWithDifferentArgs) # -> ""
	$PositiveInt->equal($Int)                  # -> ""
	
	$Int->equal("not a type") # -> ""
	
	my $PositiveInt2 = Aion::Type->new(name => "PositiveInt", as => $Str);
	$PositiveInt->equal($PositiveInt2) # -> ""
	
	$Int->equal($PositiveInt) # -> ""
	$PositiveInt->equal($Int) # -> ""
	
	my $PositiveIntWithArgs = Aion::Type->new(name => "PositiveInt", as => $Int, args => [1]);