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`node.create` read its `parent` as `id(p, "parent").unwrap_or(page)`, so a `parent` that isn't a
layer id — a `{"$step": n}` nothing had resolved, a name, a negative number — quietly meant "no
parent" and the layer landed on the page, with the call reporting success. The same shape sat on
`image.place` and `instance.create`, on `index` (a string index appended where it was asked to
insert), and on the `ids` of every command that targets layers (an entry that wasn't an id was
dropped and the rest ran). A number that names nothing was reported; anything that isn't a number at
all was not.
`params::opt_id` and `params::opt_index` now say what the commands mean: missing and `null` are
"none", and anything else has to be a layer id (or a whole, non-negative number) and is named when it
isn't. `req_targets` refuses an `ids` entry that isn't an id, before falling back to the selection. A
number that names no layer still reports `no such node`, and a boolean is still a number to `f64_of`,
as it is for `x`, `width` and the rest.
This turns a silently wrong result into an error on purpose, so a caller that passed something that
isn't an id and relied on the fallback now hears about it.