What is your wild guess: How many different ways does Ruby provide for inserting a NULL byte into a double-quoted string?
There are exactly 43 options¹! Here is the list, put together with some ideas from Episode 61: Meta Escape Control:
| Directly embedded NULL byte | # => "\u0000" |
| "\0" | # => "\u0000" |
| "\x00" | # => "\u0000" |
| "\x0" | # => "\u0000" |
| "\u0000" | # => "\u0000" |
| "\u{0000}" | # => "\u0000" |
| "\u{000}" | # => "\u0000" |
| "\u{00}" | # => "\u0000" |
| "\u{0}" | # => "\u0000" |
| "\u{00000}" | # => "\u0000" |
| "\u{000000}" | # => "\u0000" |
| "\000" | # => "\u0000" |
| "\00" | # => "\u0000" |
| "\C-\0" | # => "\u0000" |
| "\C-\x00" | # => "\u0000" |
| "\C-\x0" | # => "\u0000" |
| "\C-\000" | # => "\u0000" |
| "\C-\00" | # => "\u0000" |
| "\C-@" | # => "\u0000" |
| "\C-\x40" | # => "\u0000" |
| "\C-\100" | # => "\u0000" |
| "\C-`" | # => "\u0000" |
| "\C-\x60" | # => "\u0000" |
| "\C-\140" | # => "\u0000" |
| "\C- " | # => "\u0000" |
| "\C-\s" | # => "\u0000" |
| "\C-\x20" | # => "\u0000" |
| "\C-\40" | # => "\u0000" |
| "\c\0" | # => "\u0000" |
| "\c\x00" | # => "\u0000" |
| "\c\x0" | # => "\u0000" |
| "\c\000" | # => "\u0000" |
| "\c\00" | # => "\u0000" |
| "\c@" | # => "\u0000" |
| "\c\x40" | # => "\u0000" |
| "\c\100" | # => "\u0000" |
| "\c`" | # => "\u0000" |
| "\c\x60" | # => "\u0000" |
| "\c\140" | # => "\u0000" |
| "\c " | # => "\u0000" |
| "\c\s" | # => "\u0000" |
| "\c\x20" | # => "\u0000" |
| "\c\40" | # => "\u0000" |
¹ And this is just in the context of double-width strings without interpolation: Another fun NULL byte is 0.chr, as noted by @cremno
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