amend and item amend are completely different verbs with the monadic version
much more similar to a "select" operation than an update operation.
(v0`v1`v2)} y is a select verb, that doesn't even match the update behaviour,
and so doesn't need to be made ambivalent to dyadic x (v0`v1`v2)} y
my suggestions:
v0`v1} would be (v0 {"0 1&.|: v1) and can/could be called ambivalently
(v0`v1`v2)}y would be (v0 y) (v1 y)} ( v2 y) (calling amend even
monadically... and also the same verb as dyadic call
I would suggest that the entire history of use for v0`v1`v2} y has been a
mistaken omission of the x parameter on an intended amend call.
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