Make sure value option in obs works with lists and vectors

[zachary-foster]

Currently, the value option of obs takes the name of a column in a table to extract values from for each taxon.
This does not make sense for lists/vectors.
I am thinking of modifying so it accepts TRUE/FALSE.
Alternatively, it might work already if you use the same value as data.

[zachary-foster]

Actually, it does make sense for lists and vectors since any value in all_names() works with value. I just checked, and it works with both lists and vectors already.