[ruby-core:114936] [Ruby master Feature#19908] Update to Unicode 15.1

2 Oct 2023

      Issue #19908 has been reported by nobu (Nobuyoshi Nakada).

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Feature #19908: Update to Unicode 15.1
https://bugs.ruby-lang.org/issues/19908

* Author: nobu (Nobuyoshi Nakada)
* Status: Assigned
* Priority: Normal
* Assignee: duerst (Martin Dürst)
* Target version: 3.3
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The Unicode 15.1 is released.

The current enc-unicode.rb seems to fail because of `Indic_Conjunct_break` properties with values.

I'm not sure how these properties should be handled well.
`/\p{InCB_Liner}/` or `/\p{InCB=Liner}/` as the comments in that file?
https://github.com/nobu/ruby/tree/unicode-15.1 is the former.

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