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Quick guide

Official content
Returns true if object has the same length and content; as self; false otherwise:
s = 'foo'
s == 'foo' # => true
s == 'food' # => false
s == 'FOO' # => false
Returns false if the two strings' encodings are not compatible:
"\u{e4 f6 fc}".encode("ISO-8859-1") == ("\u{c4 d6 dc}") # => false
If object is not an instance of String but responds to to_str, then the two strings are compared using object.==.
rb_str_equal(VALUE str1, VALUE str2)
    if (str1 == str2) return Qtrue;
    if (!RB_TYPE_P(str2, T_STRING)) {
        if (!rb_respond_to(str2, idTo_str)) {
            return Qfalse;
        return rb_equal(str2, str1);
    return rb_str_eql_internal(str1, str2);

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