This is adequately documented in perlvar (%SIG) and the documentation for die (at the bottom). A workaround is to put this as the first line in your signal handler for __DIE__: 
die @_ if $^S;

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In reply to Re: And yet more $SIG{__DIE__} fun... by Fastolfe
in thread And yet more $SIG{__DIE__} fun... by Adam

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