eql?

/*
 * call-seq:
 *   str.eql?(other)   => true or false
 *
 * Two strings are equal if the have the same length and content.
 */

static VALUE
rb_str_eql(str1, str2)
    VALUE str1, str2;
{
    if (TYPE(str2) != T_STRING || RSTRING(str1)->len != RSTRING(str2)->len)
        return Qfalse;

    if (memcmp(RSTRING(str1)->ptr, RSTRING(str2)->ptr,
               lesser(RSTRING(str1)->len, RSTRING(str2)->len)) == 0)
        return Qtrue;

    return Qfalse;
}