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Showing content from https://docs.ruby-lang.org/en/master/OpenSSL/../case_mapping_rdoc.html below:

case_mapping - Documentation for Ruby 3.5

Some string-oriented methods use case mapping.

In String:

• String#capitalize

• String#capitalize!

• String#casecmp

• String#casecmp?

• String#downcase

• String#downcase!

• String#swapcase

• String#swapcase!

• String#upcase

• String#upcase!

In Symbol:

• Symbol#capitalize

• Symbol#casecmp

• Symbol#casecmp?

• Symbol#downcase

• Symbol#swapcase

• Symbol#upcase

By default, all of these methods use full Unicode case mapping, which is suitable for most languages. See Section 3.13 (Default Case Algorithms) of the Unicode standard.

Non-ASCII case mapping and folding are supported for UTF-8, UTF-16BE/LE, UTF-32BE/LE, and ISO-8859-1~16 Strings/Symbols.

Context-dependent case mapping as described in Table 3-17 (Context Specification for Casing) of the Unicode standard is currently not supported.

In most cases, the case conversion of a string has the same number of characters as before. There are exceptions (see also :fold below):

s = "\u00DF" 
s.upcase     
s = "\u0149" 
s.upcase     

Case mapping may also depend on locale (see also :turkic below):

s = "\u0049"        
s.downcase          
s.downcase(:turkic) 

Case changes may not be reversible:

s = 'Hello World!' 
s.downcase         
s.downcase.upcase  

Case changing methods may not maintain Unicode normalization. See String#unicode_normalize.

Except for casecmp and casecmp?, each of the case-mapping methods listed above accepts an optional argument, mapping.

The argument is one of:

• :ascii: ASCII-only mapping. Uppercase letters (‘A’..‘Z’) are mapped to lowercase letters (‘a’..‘z); other characters are not changed

  s = "Foo \u00D8 \u00F8 Bar" 
  s.upcase                    
  s.downcase                  
  s.upcase(:ascii)            
  s.downcase(:ascii)          
  

• :turkic: Full Unicode case mapping. For the Turkic languages that distinguish dotted and dotless I, for example Turkish and Azeri.

  s = 'Türkiye'       
  s.upcase            
  s.upcase(:turkic)   
  
  s = 'TÜRKIYE'       
  s.downcase          
  s.downcase(:turkic) 
  

• :fold (available only for String#downcase, String#downcase!, and Symbol#downcase). Unicode case folding, which is more far-reaching than Unicode case mapping.

  s = "\u00DF"      
  s.downcase        
  s.downcase(:fold) 
  s.upcase          
  
  s = "\uFB04"      
  s.downcase        
  s.upcase          
  s.downcase(:fold) 
  

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