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$ ./2.create.bash with_utf8.pl
The shebang is specifying bash
Using bash 4.4.19(1)-release
...
without_utf8.pl: text/plain; charset=utf-8
with_utf8.pl:    text/plain; charset=utf-8
$

$  perl -pe 's/^(?=.*utf8)/#/' 1.pl | tee 1.without_utf8.pl
#!/usr/bin/perl -w
use 5.011;
...
$string = 'alleß';
Dump($string);
$

$ ./1.pl
string is G�del
SV = PV(0x556af89dcda0) at 0x556af8a06fa0
...
  LEN = 10
  COW_REFCNT = 1
$

$ ./1.without_utf8.pl 
string is Gödel
SV = PV(0x5584c04dbda0) at 0x5584c0505a88
...
  LEN = 10
  COW_REFCNT = 1
$

$ iconv -f UTF-8 -t us-ascii 1.pl -o 1.us-ascii.pl
iconv: illegal input sequence at position 72
$