Covelli,

From
?rep

Non-integer values of times will be truncated towards zero. If times is a
computed quantity it is prudent to add a small fuzz.

Thus, the example is a very interesting special case of FAQ 7.31,

> sprintf("%17.17a",66)
[1] "0x1.08000000000000000p+6"
> sprintf("%17.17a",pr)
[1] "0x1.07fffffffffff0000p+6"
>

We see that pr is just a tiny bit smaller than 66 and gets rounded down to
65.

Rich

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