[ruby-core:74676] [Ruby trunk Bug#12204] Invalid range of capital letters at Greek alphabet

Issue #12204 has been updated by Yui NARUSE.

Backport changed from 2.1: DONE, 2.2: DONE, 2.3: REQUIRED to 2.1: DONE, 2.2: DONE, 2.3: DONE

ruby_2_3 r54384 merged revision(s) 54210.

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Bug #12204: Invalid range of capital letters at Greek alphabet
https://bugs.ruby-lang.org/issues/12204#change-57804

* Author: George Vrettos
* Status: Closed
* Priority: Normal
* Assignee: 
* ruby -v: ruby 2.3.0p0 (2015-12-25 revision 53290) [x86_64-linux]
* Backport: 2.1: DONE, 2.2: DONE, 2.3: DONE
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Greek alphabet's first and last letter is:
* α - ω (lower case)
* Α - Ω (upper case)

So if we write on a ruby console the following script, we get:

~~~
('α'..'ω').to_a

=> ["α", "β", "γ", "δ", "ε", "ζ", "η", "θ", "ι", "κ", "λ", "μ", "ν", "ξ", "ο", "π", "ρ", "ς", "σ", "τ", "υ", "φ", "χ", "ψ", "ω"] 
~~~

**which is correct**, we get all **24  lower case characters** of the greek alphabet, and a "special one", the letter "ς" which HAS NO EQUIVALENT uppercase letter. TOTAL: 25 characters 

Now if we try to run the above script with upper case characters...

~~~
('Α'..'Ω').to_a

=> ["Α", "Β", "Γ", "Δ", "Ε", "Ζ", "Η", "Θ", "Ι", "Κ", "Λ", "Μ", "Ν", "Ξ", "Ο", "Π", "Ρ"]
~~~
**we only get 17 characters**. The rest 7 upper case characters are missing! Those are (["Σ", "Τ", "Υ", "Φ", "Χ", "Ψ", "Ω"])


Now if we try to "construct" the greek alphabet by using the UTF-8 equivalent number of its chatacter, we get the following:

~~~
(913..937).map { |char| char.chr('UTF-8') }

=> ["Α", "Β", "Γ", "Δ", "Ε", "Ζ", "Η", "Θ", "Ι", "Κ", "Λ", "Μ", "Ν", "Ξ", "Ο", "Π", "Ρ", "\u03A2", "Σ", "Τ", "Υ", "Φ", "Χ", "Ψ", "Ω"]
~~~

Note the invalid character **"\u03A2"** between letters "Ρ" and "Σ". 

I believe that the problem is the letter "ς" (greek sigma) which **has no upper case equivalent**. Ruby throws an exception at this point and never returns the rest of the characters.
  

[[http://www.fileformat.info/info/unicode/char/03a2/index.htm]]



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