alhudz opened a new pull request, #1718:
URL: https://github.com/apache/commons-lang/pull/1718
Repro: `ArrayUtils.lastIndexOf(new double[]{Double.NaN}, Double.NaN)`
returns `-1`, while `ArrayUtils.indexOf` on the same array returns `0` (and
`contains` returns `true`).
Cause: `indexOf(double[])`/`indexOf(float[])` were given explicit `NaN`
matching (the `indexOfNaN` helper for `double`, a `searchNaN` flag for
`float`), but the `lastIndexOf` overloads still only compare with `valueToFind
== array[i]`, which is never `true` for `NaN`.
Fix: route the two `double` `lastIndexOf` overloads (with `startIndex`, and
with `startIndex`+`tolerance`) through a new private `lastIndexOfNaN` helper
that mirrors `indexOfNaN`, and add the same `searchNaN` check to
`lastIndexOf(float[], float, int)`, so `lastIndexOf` agrees with `indexOf` on
`NaN`.
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