Allow my \$a

Allow my \$a

This applies to ‘my’, ‘our’, ‘state’ and ‘local’, and both to single
variable and lists of variables, in all their variations:

my \$a        # equivalent to \my $a
my \($a,$b)   # equivalent to \my($a, $b)
my (\($a,$b)) # same
my (\$a, $b)  # equivalent to (\my $a, $b)