Issue #13925 has been reported by tompng (tomoya ishida).

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Bug #13925: string.split(pattern, 1) should return [self.dup], but it returns [self]
https://bugs.ruby-lang.org/issues/13925

* Author: tompng (tomoya ishida)
* Status: Open
* Priority: Normal
* Assignee: 
* Target version: 
* ruby -v: ruby 2.4.2p198 (2017-09-14 revision 59899) [x86_64-darwin16]
* Backport: 2.2: UNKNOWN, 2.3: UNKNOWN, 2.4: UNKNOWN
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```ruby
msg = 'abababababa'
msg.split('b', 4).map(&:upcase!) # won't overwrite msg
puts msg # abababababa (expected)
msg.split('b', 1).map(&:upcase!) # this overwrites msg
puts msg # ABABABABABA (abababababa is expected)
```

I wrote a patch for this.

---Files--------------------------------
split_limit_1.patch (352 Bytes)


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