If I just want to check that no unknown args are passed, I'll sometimes write something like this:

use Carp;
my %FOO_KNOWN_ARGS = map {$_=>1} qw/ quz baz /;
sub foo {
     my %args = @_;
     $FOO_KNOWN_ARGS{$_} or croak "Invalid argument '$_'" for keys %ar
+gs;
     # ...
}
foo(quz=>1,baz=>1);
foo(quz=>1,baz=>1,bar=>1); # dies
[download]

Sometimes, to prevent typos, I'll use restricted hashes via Hash::Util:

use Hash::Util qw/lock_ref_keys/;
my $foo = {};
lock_ref_keys($foo, qw/ quz baz /);
$foo->{quz} = 1;
$foo->{bar} = 1; # dies
[download]

However, both of these solutions only cover validating the keys, not the values of the hashes.

For more advanced validation, I'd suggest Params::Validate.

Or, as you suggested, you can make a simple object, for this I'd recommend Moo over Moose, as the former is (with a few minor exceptions) a subset of the latter, and is more lightweight. You can implement constraints on the values manually using coderefs, or with something like Type::Tiny.

{   package Foo;
    use Moo;
    use Types::Standard qw/ Str Int /;
    use Type::Utils qw/ declare as where /;
    use namespace::clean;
    has foo => ( is=>'ro', required=>1,
        isa => sub { $_[0]=~/^bar\d+$/ or die "Invalid foo" } );
    has bar => ( is=>'ro', required=>1, isa => Int );
    my $Hostname = declare as Str, where { /^\w+(\.\w+)*$/ };
    has quz => ( is=>'ro', required=>1, isa => $Hostname );
    sub baz {
        my $self = shift;
        print "baz, my foo is ",$self->foo,"\n";
    }
}
my $foo = Foo->new(foo=>'bar123', bar=>4, quz=>'aa.bb.cc');
$foo->baz;
baz2($foo);
baz2({x=>1}); # dies

# possible alternative to Foo::baz
use Scalar::Util qw/blessed/;
sub baz2 {
    my $foo = shift;
    die "Not a Foo" unless blessed($foo) && $foo->isa('Foo');
    print "baz2, the foo is ",$foo->foo,"\n";
}
[download]

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