I highly doubt that your approach works at all. Have you checked that your approach works?

Data structures can easily be checked using Data::Dumper:

use strict;
use Data::Dumper;

print "Check 1\n";
print Dumper {
     'field1' => 'value',
     'field2' => 'value',
     'checkfield' => '1'
};

print "Check 2\n";
print Dumper {
     'field1' => 'value',
     'field2' => 'value',
     'checkfield' => '1',
     'checkfield' => '3'
  }
;
print "Check 3\n";
print Dumper {
     'field1' => 'value',
     'field2' => 'value',
     'checkfield' => '1',
     'checkfield' => '3',
     'checkfield' => '5'
}
[download]

If you compare the output with the code, you will see that your approach does not work and never will work, because the API you are trying to use does not allow duplicate elements.

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