Not relevant for this specific case, but there is a difference if the thing being appended is a number:
$ perl -e'use Devel::Peek; my $x = 5; Dump($x) ; my $y .= 5; Dump($y);
+'
SV = IV(0x2fc84) at 0x2fc88
REFCNT = 1
FLAGS = (PADMY,IOK,pIOK)
IV = 5
SV = PV(0x13838) at 0x2fcd8
REFCNT = 1
FLAGS = (PADMY,POK,pPOK)
PV = 0x2ac18 "5"\0
CUR = 1
LEN = 12
i.e. .= will stringify on assigment.
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