view release on metacpan or  search on metacpan

Guile.pm  view on Meta::CPAN

That's because Perl transformed the $number into a string scalar in
order to concatenate "0" to it.  Thus, new() created an SCM with the
string value "100".  The difference doesn't matter to Perl but a Guile
function you call might not be expecting a string instead of a number.
To solve this problem, you need to create the SCM with an explicit
type:

   my $scm = new Guile::SCM integer => $number;

Another reason to use an explicit type is to create types that have no
obvious corollary in Perl, like a pair.  Normally Guile assumes that
array-refs should be translated into lists.  To create a pair you need
to specify the "pair" type and a reference to a two-element array:

   my $scm = new Guile::SCM pair => ["foo", 20];

The following types are available for use with new():

   integer
   real
   string