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Get value at key.
Similar: get, getAll, getPath. Similar: get, set, remove.
function get(x, k) // x: a map // k: key
const map = require('extra-map'); var x = new Map([['a', 2], ['b', 4], ['c', 6], ['d', 8]]); map.get(x, 'b'); // → 4 map.get(x, 'd'); // → 8