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Returns the integer hash value for +self+.
Two \String objects that have identical content and compatible encodings
also have the same hash value;
see Object#hash and {Encodings}[rdoc-ref:encodings.rdoc]:
s = 'foo'
h = s.hash # => -569050784
h == 'foo'.hash # => true
h == 'food'.hash # => false
h == 'FOO'.hash # => false
s0 = "äöü"
s1 = s0.encode(Encoding::ISO_8859_1)
s0.encoding # => #<Encoding:UTF-8>
s1.encoding # => #<Encoding:ISO-8859-1>
s0.hash == s1.hash # => false
Related: see {Querying}[rdoc-ref:String@Querying].
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