amr-unknown conflates "who" and "what"

[nschneid]

Often we can guess from context whether amr-unknown refers to a person or not, as in these Dictionary examples:

• What did the girl find? (find-01 :ARG0 girl :ARG1 amr-unknown)
• Whose car is this? (car :poss amr-unknown :domain this)

But sometimes it is ambiguous: the first AMR would also apply to "Who did the girl find?" Likewise, currently "Who did you see?" and "What did you see?" both collapse to (see-01 :ARG0 you :ARG1 amr-unknown). AFAICT this is an exception in AMR: normally we do not remove animacy distinctions that are present in the language; "he" and "she" are retained rather than collapsed with "it", for example.

Would it be worth marking the distinction, e.g. mapping "who" to amr-unknown-person or amr-unknown :mod person ('which person')?