Is `rest` a good name for extra fn mappings?

[cowboyd]

When invoking a function as a map, you can pass "modifiers":

$call: argument
mod1: "hello"
mod2: "world"

Right now these are represented as rest in the PSValue for a function, but this relates more the the implementation than anything else in the sense that we "spread out the keys of a map when looking if something is a function call":

let [first, ...rest] = map.entries();

What should the platformscript terminology be for this quite unique capability. "keys", "modifiers", "options"