number str is treated as int with Xslate

gistfile1.txt

#!/usr/bin/perl --

use strict;
use Text::Xslate;

my $xs = Text::Xslate->new(
	syntax => 'TTerse',
);

my $template = <<'END';

[%- MACRO foo(n) BLOCK -%]
	<li>n is [% n %]</li>
[%- END # macro -%]

<ul>
	[% foo("01") %]
	[% foo("02") %]
	[% foo("03") %]
</ul>

END

print $xs->render_string( $template, {} );

__END__

<ul>
		<li>n is 1</li>
		<li>n is 2</li>
		<li>n is 3</li>
</ul>