I playing with the syntax of ranges, like my $h={args=>[0..5]}, my $h={args=>[0..-1]} and a few others, I came up with a range that surprised me: my $h={args=>["0".."-1]}

Using P::P to print the value, as it's made for cases like this (1st, the more normal cases, then the odd one: 

> tperl                    #alias tperl='perl -we'\''use strict; use P
+;'
my $h={args=>[0..5]};               
P "h=%s", $h;
'
h={args=>[0, 1, 2, 3, 4, 5]}

> tperl      
my $h={args=>[0..-1]};
P "h=%s", $h;
'
h={args=>[]}

### then I tried:

> tperl                    
my $h={args=>["0" .. "-1"]};   
P "h=%s", $h;
'
h={args=>[0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17
+, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34,
+ 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 
+52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 6
+9, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86
+, 87, 88, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99]}

# (and)

> tperl      
my $h={args=>[q(00) .. q(-1)]}; 
P "h=%s", $h;'
h={args=>[00, 01, 02, 03, 04, 05, 06, 07, 08, 09, 10, 11, 12, 13, 14, 
+15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 3
+2, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49
+, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66,
+ 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 
+84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99]}

[download]

So a quoted 0 started with 0, and a double zero ended up with a leading zero for 0-9, but the odd part was the "-1" turning into "99".

Huh? That's weird. Why does it do that?

Thanks...

In reply to curious behavior: why does it do this? by perl-diddler

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