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`Promise.limit` (ext/promise/limit)

Helps to limit concurrency of asynchronous operations.

const limit = require("ext/promise/limit").bind(Promise);

const limittedAsyncFunction = limit(2, asyncFunction);

imittedAsyncFunction(); // Async operation started
imittedAsyncFunction(); // Async operation started
imittedAsyncFunction(); // On hold until one of previously started finalizes