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Check if map has a key.
Similar: has, hasValue, hasEntry, hasSubset, hasPath. Similar: randomKey, keys, has.
function has(x, k) // x: a map // k: search key
const map = require('extra-map'); var x = new Map([['a', 1], ['b', 2], ['c', -3]]); map.has(x, 'd'); // → false map.has(x, 'c'); // → true