Use of uninitialized value in subroutine entry..

You should see at least a line number associated with this warning (not error) message, and it should be fairly easy to zero in on the argument the subroutine is expecting and not getting.

my $typehint_raws = [ ($typehint_raw) x  @$hashref];

If @$hashref is indeed a hash reference, I don't see how the code runs beyond that statement.

Win8 Strawberry 5.8.9.5 (32)  Wed 05/11/2022 21:07:27
C:\@Work\Perl\monks
>perl

use strict;
use warnings;

my $hr = { qw(a b  c d) };

print "got here \n";
print @$hr, "\n";
# print %$hr, "\n";  # works
print "and here \n";

^Z
got here
Not an ARRAY reference at - line 8.
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