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use v5.12;
use strict;
...
cmp_ok( 3.9 <=> 3.9, '==', 0, "3.9 <=> 3.9 == 0" );
cmp_ok( 4 <=> 4, '==', 0, "4 <=> 4 == 0" );

# Running tests: 
1..14
...
ok 12 - 4 <=> 3.9 == 1
ok 13 - 3.9 <=> 3.9 == 0
ok 14 - 4 <=> 4 == 0