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Returns an array of lines in str split using the supplied record separator ($/ by default). This is a shorthand for str.each_line(separator, getline_args).to_a.
If chomp is true, separator will be removed from the end of each line.
"hello\nworld\n".lines              #=> ["hello\n", "world\n"]
"hello  world".lines(' ')           #=> ["hello ", " ", "world"]
"hello\nworld\n".lines(chomp: true) #=> ["hello", "world"]
If a block is given, which is a deprecated form, works the same as each_line.
               static VALUE
rb_str_lines(int argc, VALUE *argv, VALUE str)
    VALUE ary = WANTARRAY("lines", 0);
    return rb_str_enumerate_lines(argc, argv, str, ary);

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