For example, if I comment out this single line from your latest script: tie %SIG,'SpyHash'; then my output becomes: 
 
start: $VAR1 = undef;

after tie: $VAR1 = undef;

after set handler: $VAR1 = sub { "DUMMY" };

after require: $VAR1 = undef;

after import: $VAR1 = undef;

after creating instance: $VAR1 = undef;

after resolving localhost: $VAR1 = undef;

after resolving junk: $VAR1 = undef;

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In reply to Re^7: SIG{CHLD} altered by require statement on Perl 5.12.1 by sdingare
in thread SIG{CHLD} altered by require statement on Perl 5.12.1 by sdingare

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