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1 + 2 results in an integer.
1 . 2 converts both to strings and concats them.
1 + 2.0 converts 1 to a higher precision and results in an double.
1 . 2.0 converts to '1' and '2' and concats them.
'1.0 word' + 2 converts '1.0 word' to a double and ignores the 'word' part and results in an double.
'1.0 word' . 2 converts '2' to a string and concats them.