[ruby-core:100217] [Ruby master Feature#13153] Inconsistent sprintf formatting for 0 value

Issue #13153 has been updated by nobu (Nobuyoshi Nakada).


This behavior comes from ANSI-C, and same as printf(1).
I don't think this is a bug.

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Feature #13153: Inconsistent sprintf formatting for 0 value
https://bugs.ruby-lang.org/issues/13153#change-87806

* Author: RickHull (Rick Hull)
* Status: Open
* Priority: Normal
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```ruby
0.upto(5).map { |i| "%#0.2x" % i }

# expect: ["0x00", "0x01", "0x02", "0x03", "0x04", "0x05"]

# actual: ["00", "0x01", "0x02", "0x03", "0x04", "0x05"]
```

Notice that the 0x is omitted when i == 0.  The 0x prefix is specified by '#' (and 'x') in the format string.  If this is expected behavior, then it sure is surprising and undocumented AFAIK.  *goes back to double check*

Behavior on 2.4.0 confirmed on 2.3.3 as well.



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