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* Implement dial, support IPv6 in httpclient Added ``dial`` procedure to networking modules: ``net``, ``asyncdispatch``, ``asyncnet``. It merges socket creation, address resolution, and connection into single step. When using ``dial``, you don't have to worry about IPv4 vs IPv6 problem. Fixed addrInfo loop in connect to behave properly. Previously it would stop on first non-immediate failure, instead of continuing and trying the remaining addresses. Fixed newAsyncNativeSocket to raise proper error if socket creation fails. Fixes: #3811 * Check domain during connect() only on non-Windows This is how it was in the previous implementation of connect(). * Call 'osLastError' before 'close' in net.dial * Record osLastError before freeAddrInfo in net.dial * Add missing docs for 'dial' proc * Optimize dial to create one FD per domain, add tests And make async IPv6 servers work on Windows. * Add IPv6 test to uri module * Fix getAddrString error handling