For the second problem I would just write a small function: 
sub error_out {
  defined(wantarray()) ? shift : croak("Untrapped error '$_[0]'");
}

[download]
and then in your module generously use code like: 
  return error_out($failure) if $failure;

[download]

In reply to Re (tilly) 2: Stringing method calls by tilly
in thread Stringing method calls by mirod

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