[perl #127344] fail to handle numbers as option name for MAIN

[via RT]

# New Ticket Created by  Rick Bychowski 
# Please include the string:  [perl #127344]
# in the subject line of all future correspondence about this issue. 
# <URL: https://rt.perl.org/Ticket/Display.html?id=127344 >


test.pl:
sub MAIN (*%h) { %h.keys.say; };

then test.pl --foo=bar --42=bat
returns (-42 foo)

why -42?