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Set value at key.
Similar: get, set, remove.
function set(x, k, v) // x: entries // k: key // v: value
const entries = require('extra-entries'); var x = [["a", 2], ["b", 4], ["c", 6], ["d", 8]]; [...entries.set(x, "b", 40)]; // → [ [ "a", 2 ], [ "b", 40 ], [ "c", 6 ], [ "d", 8 ] ] [...entries.set(x, "d", 80)]; // → [ [ "a", 2 ], [ "b", 4 ], [ "c", 6 ], [ "d", 80 ] ]