programmatically determine blockwise visual mode

Hi,
let's say I have script, that wants to work on the last visually
selected region, e.g. highlight it.

Is there any way, to find out, whether the last block-wise selected
region used '$' for selection (see :h v_$) or not? This matters, since
when using the '$' in visual block mode, all lines up to the end will be
selected, while when simply using the cursor to select the end point,
only up to the column specified in the last line will be acted on.

Best,
Christian
--
Es ist nichts inkonsequenter als die höchste Konsequenz, weil
sie unnatürliche Phänomene hervorbringt, die zuletzt umschlagen.
-- Goethe, Maximen und Reflektionen, Nr. 684

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