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Returns +true+ if +self+ and +object+ are equal after Unicode case folding,
otherwise +false+:
lower = :abc
upper = :ABC
upper.casecmp?(lower) # => true
lower.casecmp?(lower) # => true
lower.casecmp?(upper) # => true
Returns nil if +self+ and +object+ have incompatible encodings,
or if +object+ is not a symbol:
sym = 'äöü'.encode("ISO-8859-1").to_sym
other_sym = 'ÄÖÜ'
sym.casecmp?(other_sym) # => nil
:foo.casecmp?(2) # => nil
Unlike Symbol#casecmp, works for characters outside of 'A'..'Z' and 'a'..'z':
lower = :äöü
upper = :ÄÖÜ
upper.casecmp?(lower) # => true
lower.casecmp?(lower) # => true
lower.casecmp?(upper) # => true
Related: Symbol#casecmp, String#casecmp?.
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