Issue #11648 has been reported by Mike Pastore.

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Bug #11648: Undocumented features of String#oct
https://bugs.ruby-lang.org/issues/11648

* Author: Mike Pastore
* Status: Open
* Priority: Normal
* Assignee: 
* ruby -v: ruby 2.2.3p173 (2015-08-18 revision 51636) [x86_64-linux]
* Backport: 2.0.0: UNKNOWN, 2.1: UNKNOWN, 2.2: UNKNOWN
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String#oct will adjust the base of the stringy number being converted to 2 (if prefixed with 0B), 8 (also the default, if prefixed with 0O), 10 (if prefixed with 0D), or 16 (if prefixed with 0X). Much to my surprise this behavior is not documented at ruby-doc.org [1]. Is this the intended behavior and if so should the documentation be updated? If it is not the intended behavior, perhaps String#oct should raise an exception if someone tries to use this undocumented feature? 

1. http://ruby-doc.org/core-2.2.3/String.html#method-i-oct



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