Problem: Cannot use a lambda for 'operatorfunc'.
Solution: Support using a lambda or partial. (Yegappan Lakshmanan,
closesvim/vim#8775)
777175b0df
Omit duplicate docs. It's removed in patch 8.2.3623.
Nvim doesn't seem to need callback_set() as it was omitted when patch 8.1.1437
was first ported.