This was always confusing me, since Ruby has many ways to perform the division. So, here’s a fresh quote by Matz himself:

We have /, div, fdiv, and quo:
  /     – normal division, according to the class of operands
div    – integer division
fdiv   – float division
quo   – most accurate division (float if either operand is float, otherwise rational)
rdiv   – (which always results in rational) is obsolete.

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