Let's test that hypothesis: 

use Time::HiRes qw(gettimeofday tv_interval);

my @array = (1..100);
# say "@array"; # 0.332776 s
# say @array;   # 0.052496 s
# #<nothing>    # 0.052361 s

my $t0 = [gettimeofday];

for (1..10000)
{
   my @array2 = @array;
}

say tv_interval($t0);
__END__
SV = IV(0xe47dd8) at 0xe47de8
  REFCNT = 1
  FLAGS = (IOK,pIOK)
  IV = 1
SV = PVIV(0xe512d8) at 0xe47de8
  REFCNT = 1
  FLAGS = (IOK,POK,pIOK,pPOK)
  IV = 1
  PV = 0xe56050 "1"\0
  CUR = 1
  LEN = 16

[download]

So yes, interpolating the array into the string adds a PV (string) representation to the scalar.

Perl 6 - second systems done right

In reply to Re^2: Strange performance loss after interpolating an array and then copying to another array; by moritz
in thread Strange performance loss after interpolating an array and then copying to another array; by Kc12349

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