[O] table/calc: subscr() fails with date

[Karl Voit]

Hi!

I've found a bug when using subscr() to get the value of the previous
row. With the following date values, it fails and I don't have an idea
why:

| date                   | previous date          |
|------------------------+------------------------|
| [2015-08-21 Fri 16.57] |                        |
| [2015-12-30 Wed 11:08] | [1986, Fri, 16.57]     |
| [2016-02-01 Mon 18:33] | <2015-12-30 Wed 11:08> |
| [2016-03-01 Tue 19:01] | <2016-02-01 Mon 18:33> |
| [2016-04-01 Fri 19:39] | <2016-03-01 Tue 19:01> |
| [2016-05-01 Sun 13:01] | <2016-04-01 Fri 19:39> |
| [2016-06-01 Wed 18:24] | <2016-05-01 Sun 13:01> |
| [2016-07-02 Sat 16:44] | <2016-06-01 Wed 18:24> |
| [2016-08-01 Mon 19:18] | <2016-07-02 Sat 16:44> |
| [2016-09-02 Fri 15:34] | <2016-08-01 Mon 19:18> |
#+TBLFM: @3$2..@>$2 = subscr(@<$1..@>$1, @# - 1)

Do you have any hint or idea?


At my side: Org-mode version 8.3.4 (release_8.3.4-33-gd522fc)

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