Sync validating errors in `utils.async.Stack::callNext()` added: now if called function throws error synchronously, it will be caught and redirected into callback. Remember to don't throw sync errors after calling async operations.
Sync validating errors in `utils.async.Stack::callNext()` added:
now if called function throws error synchronously, it will be caught
and redirected into callback. Remember to don't throw sync errors
after calling async operations.

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